Well, yeah, kinda...
I 'got hold of' an XP installation disk, wiped the HD & did a clean instal. No resource errors since but I was able to plug it straight into the network, I had a lead going to a network webcam just above where the PC is now, only needed a short extension lead RJ45. Also found the driver disk for the soundcard, it's running through a huge old Sony slab-amp to a pair of hanging speakers.
The 'hardware error' in BIOS turned out to be a(nother) CPU fan gunged to a standstill with nicotine & cat hair
This PC now sits OUTSIDE (but under a lean-to roof) as the music/scoring PC for our new twin outdoor ranges.
It's also good for sitting out with a coffee in the early morning sun & listening to 'Planet Rock'-
- the neighbours have already requested that I use headphones once!