The problems with my system since SP1 was added are strange. For one thing, the computer tells me that SP1 is installed, even though every time I reboot the computer it goes through stage four of the installation process. When it gets to 69% the system boots up without finishing stage four. I have never received any error messages about the SP1 installation, and the System screen says that I am running Windows 7 Ultimate 64bit with SP1. So the computer does work since installing SP1, but it tends to be glitchy and a bit slower than before I installed SP1. Clearly something went wrong, but I have no idea about what or where the problem is. I will create a repair disk if that is necessary, but can a disk of that kind reverse the SP1 update?
The good news is this: I have a copy of everything on the computer that is important to me on a back up harddrive, so I'm not worried about losing any information.