it seems as though I have lost my HDD. I am trying to reinstall windows xp pro sp2 onto a hp computer. this is actually a rebuilt computer. when I start the comp. it states that there is a disk boot failure. i insert my copy of windows and try to set up but it says it can not access the disk. i can get to the bios settings but am not sure how to change any of these. i dont know what to do next. can anybody help?