I am having the exact same problem and I am not opening an accountant's copy, I am using quickbooks pro (desktop) - it is beyond frustrating.  I have not been in contact with Intuit beforehand - it just started happening.  The support person from Intuit said it was a Windows issue but I was calling about a different issue and didn't proceed with him on this issue - wish I had now.  I have tried everything - including uninstalling and reinstalling quickbooks, however, I did not clear the registry.  Now I am going to delete those files and see what happens.