Can you get into Safe Mode at all? Since it's an AMD, it may be the NX technology I mentioned in the other thread. If you can get into Safe Mode, you should be able to disable the setting (I don't remember where the setting is, but I remember seeing it somewhere in one of the Control Panel applets). That'd be my suggestion. Otherwise, try re-installing Windows? Either way, I guess it just goes to show that backing up before you install major updates is a really good idea.

AJ