Bluetooth Keyboard & Magic Mouse dont work always when choosing OS?

Hello, I have an IMAC, Brand New, i3 dual core 3.2, running OSX 10.6.6. I loaded Win7 thru Bootcamp, as I have done on at least 20 Macs. But once in the past I had similar trouble with the Bluetooth Keyboard & Magic Mouse. Well, I finally got it to work in OSX & in Windows7. But the problem now is this: MAC OSX is the target start disc, so While booting into Win7 I hold down the alt key to get the boot screen with the MAC OSX or the Windows 7 as my choices, but when the boot screen comes up, guess what? My mouse does not work, so I cannot select the Windows7 icon. Just in that Boot screen while not in OSX & not in Win7, the bluetooth magic mouse is DEAD! now if I plug in a USB mouse and click on the WIN7 icon and it boots up....then keyboard & mouse will once windows opens up. HELP>>>>this is making me Crazy. I am running OSX 10.6.6 I did all of the software updates, and I updated Bootcamp. One other issue, when in bootcamp and I attempt to dowhnload and burn the windows support drivers to disk, it appeasr to download but when I click on Burn to disc, it just does nothing, If I click continue, the burn screen opens so I can click burn to disk, again, nothing happens. So All of the drivers I have loaded I have either taken from the OSX installation disc, or downloaded a few updates from the apple support site. thanks and I challenge you to solve this problem...or set of problems....and Thanks in advance.

Mike