I have a Dell Dimension 5150 computer with Windows XP.Professional. When I turn on the computer it goes through booting then this pops up on screen" Isass.exe - System Error" and below that" Object name not found". When I click OK it reboots and does the same thing and won't go any further. I booted from Windows Defender CD and it found one problem that was quarantined and deleted. It won't boot from Avira Rescue on any other CD that I have tried. I don't have the original XP CD so haven't tried booting from that.
I am new here and don't have a lot of computer knowledge. If someone could tell me how to fix this in novice language, I would very greatly appreciate your effort to help me.