Microsoft Wireless Laser Desktop 4000 Keyboard/Mouse "device stoped responding" Questions

...stoped being recognised by the system & as soon as I unplug from the mains the laptop dies. Thats ok I was going to hold out until Dell had a sale as their Battery prices are outrageous. But then ...

...device... After this, I also installed the driver, but it was of no use... I also attempted to re-establish the connection between the mouse and the receiver... No good.... Didn't change anything... ...