windows xp loops on start up

B

Barry

Dear all
When I start the pc, it goes to the desktop, but only shows the
background picture, then it goes back to a welcome screen and invites me
to log in.
I click on the icon and it say loading, then it says shutting down, and
goes back to the login screen with the icon.

It does the same if I try safe mode.
So I cannot login at all.

Using Windows XP and I think service pack 3 is installed.

Help please.
Barry
 

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