Trouble with blue tooth mouse

I have just wipped my computer clean with a reinstall of windows vista business 32 bit. I have a bluetooth keyboard and mouse which I was using with my computer before the install. ONce the install was completed my keyboard started to work automatically. My mouse did not. I have gone to the bluetooth section of the control panel and turned on the mouse, pressed the little button so the light flashes and the computer is not finding the mouse at all. Funny thing is that the blue tooth device section is completely empty. In other words, it is not showing my keyboard as a device seen by my computer, even though my keyboard is working. Any advice on how to get my mouse working?