i have a WESTERN DIGITAL CAVIAR SE 250GB and i can not install the os WINDOWS XP SP2, because when i do so the pc would work just fine for a couple of days but then, without any reason, would not boot, giving me the start in safe mode screen, which is useless because after that there is no way of starting windows again.i´ve installed several times and it keeps always happening.i use the hd to store docs, so it means that it´s working fine but it´s impossible to work as the main hd with os.i had a virus before but i formatted the hd.what could be happening? is it the hard disk boot system corrupted? can somebody help me restore life to my hd. ps- im new here (and im portuguese ) so pardon my bad english.