Help!Remember the worm that got to my computer?

Well, after I got it fixed I can’t watch my Stairway to Heaven on any of my media players anymore! Do I need some codec thing or something for it? And do any of you know if I deleted whatever I had that enabled me to watch it? Cos I know I deleted a lot of files which I thought were useless. Or did the worm wipe it out itself??

HELP!!

I am without my daily dose of Korean melodrama:(