I had nothing but trouble with Pinnacle/Instant CD/DVD and although I don't think I experienced your particular problem on my Mesh AMD 64 3000+, My advice would be uninstall and go for something like Roxio which I find more stable with excellent facilities.
I just dont like to buy software when i can get some for free, however i am thinking with this problem i might have to. Done many searches on Pinnacle on the net and most people problems with this software.
Your problem is propably due to the software license - for use on one pc. Most likely sees your reinstall as as being installed on another pc. Ask pinnacle about this problem.
Get Nero? I have Nero 6 Reloaded on one pc and Roxio Media Creator 7 on another pc. Nero gives me nothing but trouble - Roxio has more applications and is far easiefr to use. Purchased the Roxio 7 suite from Petamediatrading.com (an Amazon reseller) Cost £11-99 for fully boxed retail version - brand new) Plus airpostage from Germany which brought the total to £15-22. What a bargain. It is fantastic. Roxios new version 7.5 is now available tho.
The new Roxio Media Suite v7.5 is now £50 on Amazon. The Creator 7 is only a couple of quid cheaper and the only reseller available at mo is one in Florida USA. £26 but it may attract customs vat + the £4 UK P.O. charge coming from the States. click here
As a comparison - our local branch of WH Smith have two copies of the boxed Roxio Media Creator 7 on the racks. The price is £69-99. With the new version now out some resellers on Amazon may get surplus stocks of the v7 boxes. I should wait a while before purchasing if you can.