Xp stuck in a reboot loop..Mup.sys..

[ExRayTed]

Hey,
Friends pc is stuck in a reboot loop.When booted it will get to the XP loading screen then reboot itself.Last known good config does the same.Safe mode gets to loading Mup.sys then reboots.

Tried fixboot and fixmbr from recovery console,same thing.Short of doing a full system restore,is there anything else I can do?

It's a pile of rubbish compaq bought from a retail store a few years ago.It's also suffered this problem before but a system restore seemed to sort out the problem.I'm tending more towards a hardware problem but wanted to pick your brains before taking things apart.

Thanks.

 

[ExRayTed]

Forgot to mention,no blue screen just a reboot.Also tried each individual stick of ram,still the same.It's almost as if the PSU isnt up to the job,but voltages in bios are fine.

 

[ExRayTed]

I've just had this on a pc I was fixing for someone. It turned out to be the hard disk having bad sectors.

I'll take it out and give it a scan in my machine..i'll give anything a go at this point.