Thanks Thermaltke - excellent
I did get the 3339 patch and some extra maps, and loaded on UT2004/patch.
But over the last 24 hours, on and off, I've been doing a fresh install. In short, I thought one of my Raptor drives was dying, half a RAID array, it was clicking and the system would freeze intermittently.
But I took the drives out, cleaned them, used new SATA data cables, used the SATA power connectors rather than the Molex plugs, and low level formatted them both.
Have just installed XP/SP2 slipstreamed and just about got everything back on there now, just Winamp to go, I think.
And now it's flying like greased lightning, something was definitely wrong before. The whole symptoms, apart from the physical clicking, smacked of a virus, but that seems unlikely.
Oh well, all is good at the moment, so I'm just about to load UT2004 on again. Luckily I saved the patch and maps to a seperate drive, so don't have to d/l them again. I shall check out the sites you recommended.
I've never played Counter Strike. I have CS:Source but am a bit wary of playing cos I shall be such a hopeless noob

Suppose I gotta start somewhere though...