Hi rewt and thanks for the welcome.
I agree, it would have helped if I'd provided some specs (*doh*), so here goes:
MSI 128MB GeforceFX 5900XT
AMD Athlon Thunderbird 1.33GHz CPU
Kingston 2x256MB PC133 SDRAM
Creative SoundBlaster Live! 5.1
Asus A7V-VM Mobo
Windows XP Pro SP1a
Thanks for that.