Wireless Mouce & Keyboard Won't Recognize

So, I'm having a problem, been having it since I built this new computer with Vista on it. I have a wireless keyboard and mouse combo, Microsoft Wireless Desktop 4000 I think. However, when the computer goes to sleep for more than around an hour or so, it seems to cut off power to the usb wireless controller. All the lights go off, and the mouse and keyboard will not wake up the computer.

If I restart the computer, the lights come on, but it still won't recognize the mouse or keyboard. The only way to get the computer to recognize them again is to go into the bios, and move the curser around (they are are recognized there), then exit and continue booting up. I've played around with the power management setting, turning off everything I can find, but they still don't seem to work.