A friend deleted what we believe to be his windows folder, we're not 100% sure, so now he can't use his computer, whenever he trys to it says he doesn't have the nltdr file, so we put that on a floppy, and then it said we need hal.dll so we put THAT on the floppy, but then it said we need the ntdlr again, and we can't get past this, so we decided to try to boot from the windows XP professional re-installation disc (his computer started with it installed) but it never gives us the option to boot from cd.
Ok go to your bios and check you cd rom as you 1st boot device. Un plugg all usb except mouse and key board. if you dont have a floppy drive check disablefloppy in your bios. Also be ready to press a key when it says "press any key to boot. Somtimes you fave to press f8 to get you cd rom to boot