Recent, my g/f`s pc was gripped with the system restore virus. I went to Malwarebtes.com site, given instructions what to do and wham the pc just reboots over n over. So, this is a pc that was built for her using XP but, that person is long gone. So, I was able to borrow the XP reinstallation dell disk from a friend to just do a Repair. I changed the boot to boot from the cd, booted the machine and it loaded windows files as normal. I chose R to repair, it asked which windows installation to repair, which was 1: C:\Windows. So, I hit 1 and enter only to be asked for admin password. Problem is she isn`t aware of one [the pc booted right into Windows xp without entering password] I tried just hitting enter but, it tells me password not valid. Like I said above, the person who built this pc, and hence installed XP is long gone. Also, anytime she booted into XP she never had to enter a password. So, I`m stumped.