WinXP system keeps rebooting.

Hi,
I have WinXP Home Edition and my system keeps rebooting
as well. I have tried to use Safe Mode, last known, etc.
I have also changed the boot sequence to boot from the CD
drive so that I can boot from the CD and it doesn't even
look at the CD drive. I am willing to reformat my hard
drive but I can't get the system to look at the CD drive
to do it.
I get a message saying that something is wrong with my
registry key. The message goes by so quickly that I
haven't been able to get the exact message.

Have anyone been able to correct this yet?
Thanks,
Sheila

>-----Original Message-----
>Hi,
>
>
>Recently, my WinXP Professional keeps on rebootingn (no
>matter what option I choose .. Safe mode ... last known
>good etc.). When I click on the icon to logon, it will
>juz reboot the computer.
>
>The latest change I've made is installing the .Net
>framework.
>
>Now, since it keeps on rebooting, I can't even uninstall
>program or troubleshooting.
>
>Would this be caused by a virus?
>
>How should I go to troubleshoot and repair this?
>
>thanks in advance,
>jackling
>.
>