The 3371 error means that the software couldn't read the license information. possibly due to an incomplete install. You need to reenter the license; you may need to do a full uninstall and reinstall. Have the license available before starting.
First try just deleting the license file:
Close Quickbooks if it is open. Depending on your OS, search for the hidden folder with the license file and delete EntitlementDataStore.ecml . (You may need to enable viewing of the hidden folders. This is accessed via the File Explorer. Double click the Computer (My Computer in XP) icon (or Start > Control Panel > Computer) to open the explorer. Click on Organize and go to the Folders and search options. In the View tab, select Show hidden folders.) For Windows Vista or Win 7, search for C:\ProgramData\Intuit\Entitlement Client\v6.0 . In XP, you need the folder C:\Documents and Settings\All Users\Application Data\Intuit\Entitlement Client\v6.0 . Just select the file and choose delete then confirm the delete command. Launch Quickbooks and follow the on-screen directions for registering the program.
The MSXML 4 software may be damaged or missing. This program is on the CD; however it may be better to download it from Microsoft, http://www.microsoft.com/downloads/details.aspx?FamilyID=7F6C0CB4-7A5E-4790-A7CF-9E139E6819C0&displaylang=en
. Try to repair the software with the command msiexec.exe /fvaum "%userprofile%\desktop\msxml.msi" (then press enter) with the above file saved to the Desktop. (Click Start or Start > Run, depending on the OS.)
If the repair doesn't work because the program isn't installed, install with the downloaded file. Otherwise uninstall it (Start > Control Panel > Programs > Uninstall) and then reinstall first the MSXML 4 and then Quickbooks.
If the above step doesn't work, then you need to uninstall Quickbooks completely. First uninstall Quickbooks from the Uninstall Wizard mentioned above. Then run the Clean Install Utility from Intuit, https://www.quickbase.com/up/bd9yykidd/g/r9/eg/va/QuickBooks%20Clean%20Install%20Utility.exe
, to remove any information from the program that was left after uninstalling. Reinstall Quickbooks after clicking OK when the program says Quickbooks is ready for a clean install.
You could manually rename the installation files instead of using the Clean Install Utility but that would clutter your hard drive.
I hope this helps. Let me know if you need any help; if you do, please add a comment with your OS.