Mouse not recognized/ mouse port not working (by 9 users)

I had the same problem with my new optical mouse. I have a wireless USB mouse, but was tired of changing batteries on it and so I bought a new corded optical mouse that uses a PS2 port. The new mouse didn't work and I searched the entire web endlessly looking for a solution and almost giving up on it.

Any way here is the solution I found that fixed it for me:

1) Control Panel -> Systems -> Hardware -> Device Manager

2) In Device Manger window go to the View menu and select Show hidden devices

3) under Mice and other pointing devices, for me, there was a yellow question mark next to PS2 port. After I right click and uninstalled the PS2 port (with the yellow question mark next to it), my computer automatically shut down and rebooted. I was able to use my optical mouse in the PS2 port afterwards.

I got the solution from another site. It may or may not work for you.