How to uninstall and reinstall mac os x...corrupt files...help!

i recently got a macbook pro to use for my photography and music and such, but i have never had a mac before and i'm used to pcs. i think a virus may have gotten on my computer because a couple days ago i went to upload a cd into itunes and i noticed that none of the songs i uploaded played. they showed up in the player but didn't actually play. so i restarted itunes and it said that my library was corrupt and that it had created a new one. the same thing happened in aperture. i exported some pictures from aperture to a file on my computer, and the pictures were there but half of them wouldn't display. so i restarted my computer, and aperture said it had to recover my folders, but it only recovered the folders that came with aperture...all of my library folders were gone. so i tried to import files from my computer into the aperture library and aperture just closed. this is actually the only way aperture will close--once it is open i have to force quit or just try to import files. since i have never worked with macs before the only way i can see to solve this problem is to burn all of my music and pictures to rewritable dvds (because those are the only files i really need) and then uninstall and reinstall mac os x. but i don't really know how to do this. any suggestions?

baltwo, you hung a couple of commas on the first two links making them non-functional, you may want to edit?
EDIT: wewillevolve, use these links:
http://www.apple.com/support/switch101
http://www.apple.com/support/mac101
-mj
[email protected]

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