Hello, VincentCrecca,
The thread you posted to was over a year old. I've split your post from the thread.
Have you written Microsoft Support regarding the "hotfix" being moved or doesn't exist anymore situation?
What anti-virus software are you using?
For those using McAfee, Spamkiller had to be disabled
Have you tried clean boot to figure out the root cause?
Perform a clean startup to determine whether background programs are interfering with your game or program
http://support.microsoft.com/kb/331796