I have been using Quicken 2001 (UK version) for a number of years without a problem, under platforms of Windows 2000, Windows XP Pro. and now Windows Vista Home Premium. This latest setup has been working quite happily for about 6 months but now, without warning, refuses to do so.
The program starts but any attempt to open a *.qdf file fails with this error
"Unable to validate your file. Contact Intuit Technical Support"
Sadly, UK versions of Quicken are no longer supported or updated by Intuit. The software is obviously fairly old but has always worked well, even with Vista. I don't believe this to be a Vista issue - it worked just fine for some months before this problem.
I have attempted to restore backups and validate the files, without success - same error message. However, the files are not corrupt because I can open them in Quicken installations under Windows 2000 and Windows XP. I have reinstalled the program - no change.
Does anyone have any further ideas, please?