if your going to reformat and install fresh copy of windows, restart ur pc and keeps pressing "DELETE" it will bring u to a blue screen menu, go into the lil menus till to come across the boot disk option and make sure its set to "boot from CD" then save and exit, make sure u have to windows cd in the cd drive while it restarts, tehn i should as you to boot from cd after the memory tests, press "Y" or wateva it says then it should come to a menu and just follow that, it isnt hard really, it should guide u to reformat and install windows or just install windows again. if its too hard for you just youtube it, always find answers there