Hiya all
well hope in a way I'm wrong about this, cos it will piss me off a little if it turns out to be right.
So far uptime just over 5 hours.
I have to go out in a few mo's and won't be back till tomoz so can't test any longer till then, so maybe someone would like to try this if you haven't already.
I only made two changes
1 I updated the firmware for my router. linksys wag54gs
2 configured my lan card to half duplex 10baseT <-really hope this isn't the answer. Having gone out and purchased a lan card for £7

Anyway so far no crashes no weird mouse, just running fine. opened about a dozen apps I'm not using just to stress pc a little more, still fine.

now 6 hours no faults