I HAVE OVER 500 TROJANS ON MY PC, HOW DO I GET RID OF THEM???????

oh my god, i just logged onto my computer and it is saying that i have over 500 trojans on my pc! WHAT DO I DO? and then all of the sudden my icons started to dissapear, and then my wallpaper turns into a pale blue color and im SCARED! what do i do???? I want a anti-spyware that DOESN'T cost any money. If you... show more oh my god, i just logged onto my computer and it is saying that i have over 500 trojans on my pc! WHAT DO I DO? and then all of the sudden my icons started to dissapear, and then my wallpaper turns into a pale blue color and im SCARED! what do i do???? I want a anti-spyware that DOESN'T cost any money. If you can help me i will be so thankful!

PLEASE HELP!
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