To all who've replied so far, many thanks.
Three weeks on, and I still haven't got gigastudio to make it's first sound. To make matters worse, I am now the proud owner of VSL Pro edition, but the cube is sitting on my piano mocking me

(can you imagine how it's killing me to have it there, but not to be able to use it?)
Relevant specs are:
Pentium 4 2.4GHz (C) CPU (800MHz FSB)
Genuine Intel 875 Chipset Motherboard (1xAGP 5x PCI, LAN)
Geforce 4 MX440 64MB AGP Video
1024MB DDR PC2700 RAM (2x 512MB, 333MHz)
80GB 7200rpm Serial Hard Disk Drive (Seagate)
120GB 7200rpm Serial Hard Disk Drive (Seagate)
Microsoft Windows XP Home Edition
Echo Mia soundcard
The only other program installed is Cubasis, which is what I will use as the sequencer on this maching. (Can I do that?)
VSL will go on the D Drive.
Latest thinking is that the chipset might be too new to support the Mia? Have ordered a Audiophile 24/96, will see if that does the trick.
Any further ideas would be greatly appreciated!