research on goodle

you will find certain way to do this PRC, (it is a worm virus)should be something about "fixblast" to fix it, and there are many ways to do this. It is not very big problem,though annoying..

then download the patch from Microsoft, PRC was soemthing about one year ago, if i am right. you dont need to reinstall your system. remember to upgrade everyghing from Windows Update, and then you will be ok.. good luck