Since you didn't tell us anything about your system, hardware or software, you get the standard instructions.
Insert the XP CD and reboot. Follow the instructions. You'll need to get any and all drivers for video, sound, modem, NIC, etc. as XP does not have these.
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My pc got spyware. I accident delete one file on regedit and my pc wont boot up. now I would like to reformat and reinstall os. please help me out. I am using windows xp.