Computer repair

Hello,
Desktop is dropping after boot. I cannot open task manager because I try but I get error message that says task manager was disabled by administrator. I have to click ok. Then I get the same problem. I cannot do a system restore because I cannot go back past the last time I tried to do it, which was two days ago. There are no more available days to restore to.
Symptoms: When I boot my pc, it comes up fine, with all the regular icons on the desktop and programs appear to be running, but then my desktop icons, and all files I might be trying to click on close down in a flash. Then they re-apear again, just to do it all over again. I managed to get to the run function to r...

Hello,

to repair my pc windows xp I have create bootalbe usb by reading article on kioskea.net
and successful in creating bootalble usb

After creating bootable usb I boot the usb to repair windows xp
i select the repair options when windows setup boots from usb
then it asks for select the windows which you want the repair and I select required partition on which window is installed

and after this setup asks for adminstrator password but I never setup any adminstrator password so please tell what should I do to run window xp repair.

Regards