There are several possible doom scenarios that can hurt/crash your beloved PC.
One of them is a nasty virus infection.
Luckily there are avir companies who offer solutions.
Bootable CD-USB rescue avir softs, freeware, complete and good working.
Good is that you don't have to be an expert to use them things when things screw up for you.
It's kinda handy to have them things in your drawer when the shit hits the fan. So, prepare yourself in the hope you'll never need those things, better safe then sorry etcetera etcetera blah blah ....
If you haven't yet, get to work and download/install the stuff peeps!!
Some nice ones:
http://www.avg.com/us-en/avg-rescue-cd
http://support.kaspersky.com/viruses/rescuedisk
http://www.f-secure.com/en/web/labs_...oval/rescue-cd
Come on, what you waiting for ? Ksss kssss get on it!!