Dell wireless adapter for Windows XP Media Centre can not find keyboard

My computer was left packed for about a year after a move. It was shipped using the original packaging and stored in a room in the new house. It worked fine before the move. Upon unpacking the wireless keyboard does not work. The wireless mouse sync and works fine. 1) The batteries in the keyboard are properly installed and new. 2) I pressed the green button on the back of the keyboard without any change in status. 3) I checked the keyboard device manager and it says it is working properly.

The first thing to do when you have a hardware problem is always to go to Device Manager :Start>My Computor{left klick on My Computor}>Properties>Hardware>Device Manager.In the drop down,find your device that is giving you problems.Double klick on the device and see what Windows says about it ,whether it needs drivers or has a physical problem.Your USB adaptor seem to be working OK since it is oscillating ,meaning that it is searching for the Keyboard transmission to lock on.This means that you have loaded the correct driver software for the usb device.I suspect that your problem is with the Keyboard power-make sure you have installed the batteries correctly{polarity check}When all is working properly,you should find the keyboard listed under Keyboards in Device Manager.Double klick on it to see if it is working properly.Your USB device should appear under USB Controllers.Regards