Ok, heres a few things that ive found out...

Apparently, only the 2 top slots have the same IRQ, so if he's having conflicts between those slots, then its probably best to move on of them to the 3rd or 4th slot down.

And here is an intresting thread i found that might be of use - http://www.techspot.com/vb/archive/index/t-4116.html

Hope you can sort it bud...