OK, here's the story:
I've burnt a few (k)vcds this week using Nero all of which have been from 790 to 805 mb in size.. had no problems - nor have I had problems in the past...

Well today I ran a virus scan and it found a worm scattered across my computer, I cleaned the virus and rebooted.. Later when I opened Nero it said that the nero executable had been modified or something , and instructed me to completely uninstall and then re-install Nero - So I did all this.

So now I have Nero back up and running but I can't seem to burn a 800 meg VCD anymore (actually it is only 796 megs).
I went into preferences and enabled the over-burn option and also deselected the "check for correct Cd format" and set the markers to 85 minutes.. rebooted. but still it will not accept my 796 meg file - says it the cd is not big enough -- I've tried several cds -- these are the same kind of 80 minute cd's I have always used, and I have always burned as close to 800 megs as I could get, sometimes over by 10 or 15 megs..
BUT now suddenly I cant even burn 800!! arggg - it's driving me crazy

Any suggestions or idea of whats wrong?