I have a program (Fix It Utilities 6) that keeps my computer clean and up to date, which also cleans/defrags my registry as well as several other areas of Windows XP. It deleted a few keys it apparently shouldn't have, & now a little box pops up that says "Preparing to Install" before I do ANYTHING. It takes awhile before it will do ANYTHING you want it to. I can't even right click on the desktop & have that little menu pop up until it thinks for a year & looks for the Missing registry keys, then the box pops up "Preparing to Install" & what seems like forever later, it does what you asked. I'm not computer illiterate and I know alot about fixing them, but this one is nuts! I put in my XP CD into the drive and figured I'd do a repair install. Won't work. Tried it within windows, and it just says "XP has encountered a problem and needs to close." Tried to boot it with the CD in the drive. Nothing. And yes, CD is 1st boot device. System Restore…Nothing. NO effect. WTF? What can I do?

Windows Movie Maker came with my computer, now it doesn't work (error/close every time I open it.) This happened because I installed a program that was made before XP existed (and at the end it told me that it may cause an error but wouldn't let me cancel)
Anyway, I uninstalled that other program but I want Windows Movie Maker back, so what are the risks when I run the software repair wizard that will repair the programs that came with my computer?

(Does it try to repair ALL programs, or will it let me choose one?)
(I have all that stuff from when i first got the computer– stored in my D drive for recovery)
(Unexpected error, "has to close")

I'm not worried about viruses, I'm worried about further software errors
some people are saying I should download it… But I already have it! I don't understand downloading it…

FROM A WEBSITE ON SFC: To protect your computer from old system files, Microsoft created a special service that is built into the operating system. This service monitors your system files, and if one is replaced or deleted, ICS will automatically restore the system file. SFC works in conjunction with a utility called Windows File Protection that keeps the system file cache: (%Systemroot%\System32\Dllcache) uppdated with the newest Microsoft Approved files as they are installed on your system. I prefer to use the system backup for the ability to roll back to a former configuration however. To manually invoke the system file checker, be sure you have administrative access then go to the command prompt and type: sfc /scannow The system will immediately begin to check all the current system files and restore the cached approved copies. You may be asked to insert the Windows CD as well during the restore. IS THERE ANY SOFTWARE AVAILABLE TO DOWNLOAD SO THAT I DONT'T HAVE TO USE THE CD?