That really sucks... Sorry to hear that you had to rebuild. I just went through that process last week with my HTPC, but I had to do it due to being backdoor'ed on the system. They did a number on it too, even replaced the process explorer with a hacked version so that I couldn't even monitor some applications that were running or kill them (found that out by loading up a different process explorer from SysInternals, great site). I figured if they knew enough of how to replace the process explorer, that they knew enough to screw/replace lots of other major parts of windows with their own hacked versions as well... Had to do a complete system wipe (DBAN is a great little tool), so I hear your pain with doing a rebuild...