Checking and 'repairing' a Win XP installation

I'm sure that under Win98 (Win95?) there was a utility of some sort which you could run to check that the windows installation was still OK, ie it checked for corrupted dll's etc and prompted you to re-install them. Is there a similar facility under XP Home?

I sense my installation has got a bit flaky over time; eg applications running slowly; working USB devices someties not being recognised and thought the above would be worth a go. If not, then beyond defragging, is there any alternative to reformatting and re-installing from scratch (ugh)?

David
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