Sounds like you downloaded the wrong sp2. There is a version that MS released that has debug info and other such on it that isn't compatable with any other version of sp2 so installing it will cause errors or not even work at all. How big is your sp2 install file? Should be exactly 266.1 mb or less (depending on what language). Edit - did you download this version - http://www.microsoft.com/downloads/details...&displaylang=en If so, that's the wrong one for you.