Chkdsk auto-runs on boot, but won't complete

Today when booting up the pc, chkdsk autostarts (it usually doesn't..) but it hangs in the same place each time..

I'm running XP (updated), but not in English, so the quotes are translated as accuratly as I can:

It first confirms files (step 1 of 3) It then confirms index(?) (2 of 3)

It then says "Correcting error in index $I30 for the file 106330" (twice)

And then "sorting index $ I30 in file 106330"

Then it just stand like that (waited 3 hrs)

There is no sort of "work noise" or lights from the machine, just the fans.. I've tried restarting a few times, but no difference..

The only thing I did yesterday that might have had this kind of effect is installing Gimp, but I can't see how..

So, what is wrong and how do I fix it?
Is it possible to bypass the chkdsk function?

(Please bear in mind that as long as I can't bypass check disk, I can't get in to Windows, and I can't fiddle with the settings)

Thanks in advance!