Restart PC and before windows splash screen, press repeatdly F8 and select "Safe Mode with Command Prompt" option. After that, try the following procedure:
Q304449 -" HOW TO: Start the System Restore Tool from a Command Prompt in Windows XP"
If you're still unable to logon, restart again, press F8 and use "Last Known Good Configuration option".
Otherwise, it could be a long procedure such as: How to Perform a Windows XP Repair Install. Before trying it, make sure that carefully read all the article, including the warnings.
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot
I was in email the other night and the power went off unexpectedly for an hour or so. When it came back on, the computer allows me to get to the sign on screen, normally and in safe mode, but when I type my password, it locks up and freezes the mouse. I've tried booting with my XP disk but it is not reading it and when the scan disk comes up it says everything is ok. I saw the cable installer do something that got him into the guest desktop without me signing on for him. Does anyone know how to do this and bypass the sign on screen? Otherwise how else can I get into the system to run the XP repair without signing on. Any help appreciatted.