After much fighting and arguing with my new computer (built from parts, but keeping some of the old parts) I'm back and running on my new computer I even have wireless Net access on it now!
It would have been finished yesterday, but Windows wasn't wanting to be cloned from my old disk to a new disk and run from the new disk. Eventually I came up with a great idea today - just clone my data and game drives to the new faster, bigger disk and leave Windows installed where it was on the old disk
And for the people who want to know, here is the spec:
Athlon 64 3500+ Venice core (I wouldn't have bothered with 64bit but the 3500+ was what came in the £800+ pre-builts I was looking at)
768MB RAM (old stuff, 256MB of which is unbranded. Could do with replacing it with DDR400 braded)
256MB ATi X800XL graphics card
200GB SATA hard drive (faster transfer rate than IDE)
40GB original IDE hard drive
and then a load of extras, Soundblaster audio, wireless card, CD-RW/DVD combo, CD drive, yada yada yada