Vista Business Blue Screen

Hi,

I am running Vista Business on a Dell C521, with a home network, (Draytek

Vigor 2800 router and Linksys Wireless G) and am sufferng a plague of Blue

Screens of Death usually, but not allways, whenever one of the the

following is done:-

1 Another machine connnects to the network via Cat5 cable.

2 Another machine connnects to the network via wireless

3 Windows mobile Smart phone connects via wireless

4 USB Memeory stick inserted into USB port

5 USB Microsoft Web cam inserted into USB port

6 Dell Axim PDA Connects

And sometimes it seems to do it just for the hell of it.

BSOD says its related to fwpkclnt.sys, which is the windows firewall i

beleive, i've tried turning it off but to no avail.

its driving me mad, so any ideas welcome

Thanks in advance

Nige