ever think about calling microsoft? for help or the company of the mouse and keyboard no way to get into it ehh?
Thats why this forum exists, to avoid calling people, and find an alternative support.
Anyways:
Plug in your old keyboard into your new computer.
Before Windows starts, press F8 a few times (thats before you see the Windows Vista loading screen)
Select Safemode from the list.
Once you get logged in, right click "My Computer", "Properties"
On the left hand menu, select "Device Manager"
Find your USB keyboard. Uninstall the driver by double-clicking the device (Should be under "Human Interface Devices" or "Keyboards")
Select the "Drivers" Tab, and select "Uninstall"
Then, restart your computer
Plug the USB Wireless Keyboard again, and let Windows install the device without the CD provided by the manufacture.