|It would be best to read and follow the owners manual.|
There are basically three ways they do it. One is to simply boot to the cd/dvd and follow instructions.
Another is to use the cd/dvd to access some hard drive area to return, again follow instruction.
In some cases you have to boot and press a F key to recover.
Once you get it returned, go straight to MS updates. Then get a good protection suite like Security Essentials or a commercial like Mcaffee or other.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.