Why won't my pc load Windows or boot?

maybe your hd isnt bad but your memory sticks.. or they may be loose in the space for them and also how many drives is your pc using? i had that same problem trying to unstall vista.. it wanted to load onto the h drive along with the existing copy of windows.. make sure your drives are all empty.. and reformatt to ntfs... if this dont work it may just be a bad pc and not worth the trouble to fix by yourself ,, and may need to be taken to a pc shop