But just in case, let's get one terrible thing out of the way. I don't know why it is but many "ultimate" installs were cracked pirate copies and those may not work well. Most folk know if they have such and that's the end of that install.
There are too many other reasons such as a antivirus suite standing guard to OS damage from trojans or malware.
I keep getting the same thing in windows update, that it's ready to install SP1 (for vista ultimate) I click to update, it says it's successful, but then when I try to do updates again (even after restarting my computer) it shows that SP1 is ready to install AGAIN. I've done this now about 5 times, and it does the same thing every time. any tips?