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…

which programs do you recommend me to make the best inspection in safe mode to my laptop sony vaio?
(sorry for poor english) thanks =D

My niece said I should always clean my computer so that it doesn't crash, but she didn't say what to do. I always empty my trash, bulk etc. in my mail accounts and I never save documents. I have only two or three favorites in my favorites file. She also said something about something happening every time you log on and to clean that up too. How do I do that? Thank you in advance for all your help.