Transactions disappearing and changing (Quicken 2008 Deluxe, Release R6)

I have Quicken 2008 Deluxe, Release R6. I only use this for posting transactions from my checking and other accounts. I do not do anything online with the program. A few days ago while using the program the total amounts changed. I exited the program and inserted the backup and reentered the transactions. The totals were correct so I backed up on a flash drive. When I opened the flash drive some of the totals were not the same and some of the transactions were not there. However, on the transactions that were not there, the totals were correct. I spoke with Quicken support but nothing they suggested worked. Has this happened to anyone else? If so, what is the solution. Do you suggest uninstalling the program and reinstalling?
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