Every time I connect most devices to the USB port, the computer freezes and I have to restart it by holding the power button on my desktop computer and turning it on again.
This always happens when I plug in most things like memory sticks or printers. The oddest (and most annoying) thing is when I start my computer with the keyboard and optical mouse plugged in, they work fine, but if I unplug one of them and try to reinsert it, (even into the same port) it freezes the computer like any other device.
Also, my portable hard drive works perfectly when plugged into any of the ports. I've tried the memory sticks and printers on other computers (and a PS3) so, I know it's not them.
I am running XP SP3. I've tried a few things to rectify this problem: Reinstalled the drivers, enabled USB related services, entered Safe Mode, checked the ports for physical damage and disabled some ports to check for power supply problems. Any more suggestions would be greatly appreciated! :)