This usualy happens when drive letters get mixed up, for example if you
moved your system disk to another computer where it was recognized as, say
E: drive than moved back.
You need to make your system forget about drive letters. This is usualy done
by rescue CD/DVD like Windows PE or Windows RE and running regedit.
Perhaps this article may help
http://support.microsoft.com/kb/947288/en-us
"JOSE LUIS" <> wrote in message
news:EBCEEAB0-3E13-4576-99A9-...
> Hi, my pc reboots just after login on every profile. I tried to start a
> non
> failure mode session but the same happened.
>
> Thanks for your comments.