Unable to connect PC

[ver_shine]

when i connect my phone using usb my screen goes Blue Screen of death
and restart pc automatically..
my pc :
windows xp sp2, .net 3
core2duo acer mobo
iphone"
8gb 1.1.4 unlocked,jailbreaked

it started today,i formated my mobo,installed xp (bcz vista sucks!)
all mobo drivers working.

whats my problem?
and another problem is when i connect to my friends pc its working normally

what shuold i do?

[ver_shine]

anyone?