New
#21
It's extremely unlikely that the offered is corrupt - but for whatever reason, your machine is perceiving it as such.
I hate 643 errors - personally, they are the one WU error that has consistently defeated me in XP
Hmm I wonder.....
You say that you are unable to use System Restore?
What exact error message do you get when you try to either create a Restore point, or restore back to a point?