Hi Diana,

There may be several issues which can cause your mouse to not work properly with Microsoft Windows.

1. Using the Num Lock key to check PC is not frozen
Make sure the computer is not frozen by pressing the Num Lock key on the keyboard. When Num Lock is pressed repeatedly, the Num Lock indicator LED on your keyboard should turn on and off.
If this indicator does not change, your computer is frozen; meaning all hardware on the computer (including the mouse) will not work. Reboot the computer to resolve this issue.

2. Mouse conflict

If any new hardware has been recently installed on the computer, remove it to help verify the new hardware is not causing a conflict with your existing mouse.

3. Not connected properly

• USB mouse

If you are using a USB mouse, disconnect the mouse cable and then reconnect to a different USB port. If the mouse is connected to a USB hub, unplug the mouse cable and the connect it to a USB port on the back of the computer.

• PS/2 mouse

If you are using a mouse with a PS/2 connection, check the back of the computer to verify that it is plugged into the PS/2 mouse port and not the PS/2 keyboard. If the mouse has worked properly in the past (I.E. this is not a new mouse), turn off the computer, then disconnect and reconnect the mouse.

• Wireless mouse
  1. Make sure the mouse is receiving power by checking for some indication of power (usually a light). If your mouse has a power switch, it is often located on the bottom side.
  2. If the mouse does not appear to be on, replace the batteries.
  3. Make sure the wireless receiver is within range and is not blocked by another object. Finally, Disconnect the wireless USB adapter and try plugging it into a different port.

4. Mouse software or driver conflict

Boot into Windows Safe Mode. If the mouse is working in Safe Mode, there is likely a driver or software conflict. To fix this problem, follow the steps below.

1. Open Windows Device Manager.
2. Expand the mouse (mice) option in Device Manager by clicking the + symbol.
3. Remove all mice listed by highlighting each device and then pressing the delete key on the keyboard.

5. Outdated or missing mouse driver

Check if a driver has been installed for the mouse. You can check in the Device Manager for this. While Windows may have a standard or default driver for the mouse, installing a driver for your specific mouse may fix the issue.
If a driver is installed for the mouse, it is recommended that you check if there is an updated driver for the mouse. Updating the driver may fix issues with a non-functioning mouse.

Hardware issues
If above solutions doesn't work, try another mouse. If that mouse works, try the mouse that is not working with another computer. If multiple mice do not work, the problem is with the mouse port. If you are using the PS/2 or USB port on the back of the computer, the motherboard is likely bad and needs to be checked by a computer expert.

I hope this helps.

Regards,
Lokesh