fire

Ok..
ive got a USB problem..


i have many devices that work on usb, and all seem to work fine when connected to the individual lines..
however when connected to a USB hub, everything connected to the hub disconnects momentarily (and that sound comes up).. then it connects again (sound plays)...

i thought it was the USB hub being a dodgy one, so i replaced the hub with a NEC 7 port USB 2.0 hub that is powered off the 5v rail from the computer molex plug....and guess what... i still get that disconnecting / connecting problem...
the power supply is fine, and tested, works with other things too, so i dont think thats my problem.

i recently re-wired all new usb lines in order to fix the problem, with no luck, they are 3m long (10 foot).. and they are shielded..

i only use 3 things on the usb hub, and ive tried trial and error to find the device thats causing the problem.. and they all do...

next.. i re-installed the computer, from fresh.. and installed nothing but these devices (usb remote, my k750 usb cable, usb thumb drive), plus the touch screen and road runner.. and i STILL get the problem!!!!

i dont know what else to check..
its either my motherboard?.. doubt it.. or windows xp sp2?....

what can i try?