My PC (Win XP, SP2) was running a bit slowly, and after sweeping it for viruses and spyware, I decided to switch off some things that are loaded on startup. I used a program that I downloaded and have used previously without problems. I switched off anything that looked unnecessary eg Copernik desktop search, some Dell multimedia things (it is a Dell laptop), can't remember the rest. I then rebooted, and it gets to the login screen. I login as normal, get the jingle that I usually get, it says "loading your personal settings", but then after a few seconds I get the shutting down jingle, it says "logging off", and I'm back to the logon screen.
I've tried F8 on reboot and tried "last known good settings" - this didn't change the problem.
I tried safe mode, and it booted up in 460x680. I managed to get the utility going again and switched back on those I remember switching off. However it is still doing the same.
Any ideas, please? Big rush, I've got work to do!!