windows xp - XP 100% CPU on Login, by random processes

I have a serious issue on my Windexs XP machine.

When I start it up it takes ages to login, then when I bring up task manager I find that its running at 100% CPU However, the process taking the CU are random (and there are usualy about 4 of them). They change a bit, but the CPU never drops below 100% at all.

I have to hit the reset button and try boot again to resolve the issue, usually it takes two or three times to get a login without the problem, and then I just put the machine in standby mode when I'm not using it.

I can't remember when this started happening, but its deffo more than a year ago.

I know its not a virus ... What could it be ? Driver issue ?

Any suggested paths for resolution would be appreciated.

Cheers, Ro

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