Keysonic Wireless Keyboard Issue

Recently upgraded from XP to 7 HE 64 bit, using a Keysonic ACK 540 RF wireless keyboard.

All was well until last weekend, when I was messing around with the AMD cool n quiet function.. When had issue and had to reboot a couple of times before pc would respond.

When it was back and running, had 2 issues;

black border around the screen image, quickly sorted by changing settings in ATI CCC.

Main issue was that the keyboard had stopped working. I changed the batteries first, still not working.

So, pull out dongle and re-insert... windows could not install driver files (or similar message)

Tried various usb ports, same result. Tried usb memory stick, works in all ports.

So, tried a roll back of Windows 7, now I get code 43, windows has stopped the device. Again, usb memory stick works in all ports.

So, am currently using extension leads for kb / mouse until I can get this sorted

Funnily enough though, when I plugged usb mouse in, the mouse does not work.

So, its not liking something to do with keyboard / mouse maybe?