How to fix QuickBooks Error 3645

QuickBooks Error 3645 when it detects a failure in the data verification process, typically caused by damaged company files.

It shows a message on the user’s screen indicating the issue

“Data Integrity Verification Failed (Error Code: – 3645)”

Common symptoms of QuickBooks Error 3645

• Periodic installation and crashing of QuickBooks software.
• Displaying error message, “QuickBooks needs to close due to an issue”.
• Slowing down of your system performance.
• Unable to restore or access company files.
• System issues / sudden shutdown of the system while using QuickBooks.

Causes

Learning the root causes of the occurrence of QuickBooks Error 3645 will help you understand the error in a better way.

Some of the potential reasons for this error :

• Due to damage to your QuickBooks company file data.
• Not being able to check data in QuickBooks Desktop.
• The verification process of QuickBooks Desktop keeps failing.
• Incorrect installation of QuickBooks.

Prerequisites to Fix QuickBooks Error 3645

Before trying to resolve QuickBooks error 3645, make sure to focus on below points :

• Company file backup – Make sure to create a backup of your company file so that you don’t have to face loss of data during the fixing process.
• Have a stable and high-speed internet connection – In case you are handling a network-based file, then a stable internet connection is required to prevent further issues.
• Installing QuickBooks File Doctor tool – You have to install this tool, as it will be required during the troubleshooting process.
• Admin access – You must have access to the admin for handling QuickBooks and the system to fix the issue.
• Updating QuickBooks version – Make sure that your QuickBooks software is updated to the recent version to reduce the chances of compatibility issues.

Solutions to troubleshoot QuickBooks Error 3645

Solution 1 – Running the Rebuild / Verify data utility

QuickBooks error 3645 occurs when the verification of data integrity fails. In that case, running the verify/rebuild data tool helps in isolating the error.

Step 1 – Checking QuickBooks company data

• Go to Window -> Close All -> QuickBooks file section.
• Now, choose Utilities and tap on verify data-

• In case the verify tool doesn’t identify any data issues, then your data is clean and integrity is confirmed. You don’t have to move to the next steps.
• Suppose any error message occurs, then search it on the QuickBooks Desktop support site to find the address.
• If you get this message, “company data has lost integrity”, it means data is damaged and you have to rebuild it.

Step 2 – Rebuilding the QuickBooks company data file

• Go to QuickBooks -> file tab -> choose Utilities -> Rebuild data tool.
• QuickBooks will now ask you to make a backup before using the Rebuild Data tool. Click OK, create the backup, choose where you want to save it, and click OK again.
• When saving the backup, don’t overwrite an old one. To avoid this, type a new name in the File name box and then click Save.
• Choose Ok after the completion of the rebuilding process and go to the File menu.
• Click Utilities-> choose verify data for checking any additional damage.

• If the tool finds more problems, you’ll have to fix them yourself. To do that, look up the error in the qbwin.log file on the QuickBooks Desktop Support Site to find steps to fix it.
• If no errors are found, you can bring back your recent backup by clicking File, then choosing Open or Restore Company.

Solution 2 – Using the QuickBooks file doctor tool to resolve company file issues.

You can fix the ‘Data Integrity Verification Failed’ error by repairing your company file using the QuickBooks File Doctor tool. This tool helps fix common problems with your company file. To use it, just follow the steps given below.

Step 1 – Installing the QuickBooks Tool Hub Program

First, you need to download and install the QB Tool Hub by following these steps:

1. Close QuickBooks, then download the latest version of QB Tool Hub from Intuit and save the file somewhere easy to find.
   Tip: If you already have Tool Hub installed, you can check its version by clicking the Home tab—the version number is shown at the bottom.
2. Open the QuickBooksToolHub.exe file you just downloaded. Follow the instructions on the screen to install it, and agree to the terms and conditions.
3. Once installed, double-click the Tool Hub icon on your desktop to open it.
   Note: If you don’t see the icon, search for “QuickBooks Tool Hub” in the Windows search bar and open it from there.
4. After installing, go to the next step and run the Quick Fix My File tool.

Step 2- Using Quick Fix My file utility

This tool helps fix common company file issues in QuickBooks. To use the Quick Fix My File tool, follow these steps:

1. Open the QB Tool Hub, go to the Company File Issues section, and click on Quick Fix My File.
2. Let the tool run, and when it finishes, click OK and open QuickBooks again.
3. Check if the data problems are fixed. If the issues are still there, move on to the next step and run the QB File Doctor tool.

Step 3 – Using the QuickBooks File Doctor Tool

The QuickBooks File Doctor tool can help fix damage or corruption in your company file. If Quick Fix My File didn’t solve the problem, follow these steps to use this tool:

1. Open the QB Tool Hub, go to the Company File Issues section, and click on QuickBooks File Doctor.
   Note: It might take up to a minute to open. If it doesn’t, search for “QuickBooks Desktop File Doc” in the Windows search bar and open it manually.
2. In the File Doctor window, select the company file you want to fix from the drop-down list. If you don’t see it, click Browse and Search, find your file, and select it.
3. Choose Check your file, click Continue, enter your QuickBooks admin password, and hit Next.
4. The scan may take 10–15 minutes, depending on your file size. Even if the scan says it didn’t work, your issue might still be fixed.
5. After the scan is done, open QuickBooks and check your company file. If the data issues are still there or you get QuickBooks Desktop error 3645, move on to the next step.

Solution 3 – Repairing your QuickBooks Desktop

Step 1 – Running Quick Fix My Program Utility

To fix common program problems, this tool closes any QuickBooks background processes. You can use it to resolve program issues by following these steps:

• First, open the QuickBooks Tool Hub. Then go to the Program Problems section and select the Quick Fix My Program tool.
• After the tool finishes running, restart QuickBooks Desktop and open your company file.
• Check if the data verification issues are resolved. If the problem still exists, proceed to run the QB Install Diagnostic tool next.

Step 2 – Running QuickBooks Install Diagnostic Utility

If the Quick Fix My Program tool doesn’t resolve the issues causing QuickBooks error code 3645, you should run the QB Install Diagnostic tool to fix installation problems by following these steps:

• Open the QuickBooks Tool Hub, go to the Installation Issues section, and select the QuickBooks Install Diagnostic Tool.
• Allow the tool to run—it may take up to 20 minutes. After it finishes, restart your computer.
• Then, open QuickBooks Desktop, access your company file, and update both the app and QuickBooks Payroll to the latest version.
• After completing these steps, check if the software is fixed and the error is resolved. If you still see the data verification failed error, proceed to the next solution.

Solution 4 – Removing QuickBooks Downloader Files manually

• Tap Windows + E to open Windows File Explorer and find QuickBooksDownloader.exe.config and QuickBooksDownloader.exe.manifest files.
• After finding the .exe files, right-click on each one and select Delete. Manually remove both files, then reopen QuickBooks and try verifying your data once more.
• Next, see if the data verification problems are resolved and confirm that QuickBooks error 3645 is fixed.

Conclusion

You’ve likely resolved QuickBooks Error 3645 using this detailed guide. If the issue persists or data verification problems remain unresolved, feel free to contact our Data Repair Support team at +1302-549-5471 or expert assistance.

FAQs

• How often should you verify QuickBooks data?

The duration depends on the usage of the file, but you must check the integrity of your QuickBooks data files once a month. Let’s say, if a file has been used multiple times by different users, then you need to verify the data weekly.

• How can you fix corrupted data in QuickBooks Desktop?

Using the QuickBooks File Doctor Tool from the QuickBooks Tool Hub can fix corruption of QuickBooks company data. You can use the Rebuild/ Check Data Tool to check data integrity issues.

• Should you take a company file backup before running the Verify/ Rebuild Data tool?

For preventive measures, it is suggested to generate a backup of the company file that is going through the verification process.

• Why is my QuickBooks saying data integrity verification failed?

QuickBooks may show a data integrity error for several reasons:

• The company file may be damaged or corrupted.
• There might be a problem with the QuickBooks software itself, like a bad installation or damaged files.
• Some Windows components may be turned off, outdated, or not working properly.
• Your computer’s system files or hard drive could be corrupted.