I have a strange problem with a new Pixxo wireless keyboard and mouse. When I first turn on the computer, the keyboard works to enter bios and move around. But when Vista starts, the keyboard and mouse do not connect. Pressing connect buttons, turning off and on don't seem to help. But when I unplug the receiver from the usb port, wait a few seconds, and then plug it back in, everything works fine.
Pixxo tech support had me check power management options on the USB root hub entries in device manager, but that didn't seem to be the problem.