Tallbloke
Based simply on what you say, and without going into the reasons why Win2K is not wanted, just trash it all by booting from a Win98 boot-up floppy, partition the drive, re-format and load 98, 98SE, or ME.
Done it often on laptops, but there are the usual caveats as to what you'll do if Dell have installed 'funny' hardware/modems etc. which 98 doesn't detect...
On average, it'll be reet!
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PistonBroke