Hmmm.. From the info you provided, it appears to be that some nasty program, that is configured to start up with windows , is causing the crashes. Try booting up in safe mode by pressing (repeatedly) F8 when booting up and selecting Start in Safe Mode. Then if you are able to log in for a longer duration, try checking again what you un-checked previously!
Also as a side note what you did would not have prevented windows from asking for password everytime it booted up. It was just a way to change the way it asks for passwrod!
I was tired of having to type in my administrator password for WinXP Pro on my computer every time I booted up. So, I clicked Start>Settings>Control Panel>User Account. Then I clicked on "change the way users log on or off".
Next, I unclicked the "Use the Welcome Screen" box, which automatically unclicked the "Use Fast User Switching" box below it and no longer made that an option. So I clicked "Apply Options" at the bottom of the screen and thought everything was fine and dandy.
Well, I restarted my computer to make sure that I know longer had that stupid Welcome Screen and it didn't. BUT....now when the computer boots, right after the HP logo flashes, a blue screen with a dialog box that pops up over it asks me for my User Name and Password. When I click, OK, everything looks fine.....the computer continues booting and then shows the black WinXp logo screen. Then when it opens to my desktop, the desktop is there for like 2 seconds and the dang computer restarts itself and goes through the whole process again: HP logo, dialog box, black XP logo screen, desktop for 2 seconds then restart. WHAT IS THE DEAL?
All I wanted was to not have that dang welcome screen everytime I got on the computer. I just wanted to be able to boot up and go straight to my desktop. PLEASE HELP as a I cannot even get onto the comp at this point!