|Make sure you downloaded the right drivers for the model.|
Sometimes you must extract the files from the download, then run the software installation.
Follow the installation directions!
Those are probably on the CD it came with if they're not on printed instructions that came with it, if you have access to a computer that has an optical drive, or can probably be read online (that's often in a Quick Start guide or similar and/or in a manual).
You MAY be required to install the software for the device FIRST, THEN you plug in it's transmitter/receiver.
Some wireless mice have a tiny switch on them (so you can switch it off to conserve it's batteries) that must be on, or have a switch that must be pressed when you first use it in Windows, before the wireless mouse will work.
Unless the instructions for installing a device tell you otherwise.......
You DO NOT install drivers for a device while booting into Windows, if the software for the device has not been installed yet - when Windows detects a generic device while booting, you allow it to search for drivers, it doesn't find any, and it wants you to show it the location of the drivers - CANCEL that, continue on to the desktop, and install the software for the device using the proper installation from a CD or the proper installation file that you downloaded from the web.
If you DID install drivers that way, go to Control Panel - Classic View - Add/Remove Programs and Un-install the software you installed, reboot, DO NOT install drivers while booting, and install the software the right way !
After you have installed the software for the mouse, the first time you connect a wireless mouse's transmitter/receiver, you will probably NOT be able to move the mouse cursor on the screen until Windows has fully loaded the desktop screen, then loads the drivers for the device.
If you need to Logon while booting, you can use the Tab key on the keyboard to toggle which thing on the screen is selected (which is highlighted or has dots around it) then press Enter, or type a password then press Enter, and Windows will continue loading (you may need to use cursor keys as well).