All you need to do, once you've backed up all your personal stuff is to make sure you have all your drivers for sound/graphics card etc, internet if you run a broadband modem, if you have a router you shouldnt need any installation discs anyway.

Then just put the cd in the drive and restart the pc, then the cd should boot up and simply follow the onscreen instructions and make a brew while it installs and updates.
It will take a good hour or so depending on your pc speed, and getting all the windows updates.


P.s if you put the cd in the drive and it boots into windows normally then let us know and ill tell you what to do