Welcome CJKC5,
Thanks for reaching out to Microsoft Q&A Forum. I understand that your Microsoft Arc Mouse still moves the cursor and scrolls, but clicking stopped working recently. You have already restarted, updated Windows, paired the mouse again over Bluetooth, and checked that the battery is at 74%.
To narrow down the issue, could you please confirm:
- Does clicking work on the Windows sign-in or lock screen, before you sign in?
- Do you use Microsoft Mouse and Keyboard Center or any other mouse or keyboard customization software?
Please make sure you already tried the Q&A Assist steps. In addition, please try the following:
1, Put in new batteries
- Even at 74%, partly drained batteries can sometimes cause buttons to stop responding while movement still works.
- Put fresh AAA batteries in the mouse, curve it to turn it on, and test clicking again.
2, Run a clean boot to rule out software conflicts
- Press Windows + R, type
msconfig, and press Enter. - On the Services tab, check Hide all Microsoft services, and then select Disable all.
- On the Startup tab, select Open Task Manager and disable all startup items.
- Restart the PC and test clicking. If clicking works, turn the services back on a few at a time to find the one causing the problem.
3, Stop Windows from turning off the Bluetooth adapter to save power
- Right-click Start and select Device Manager.
- Expand Bluetooth, right-click your Bluetooth adapter, and select Properties.
- On the Power Management tab, uncheck Allow the computer to turn off this device to save power, select OK, and restart.
Looking forward to your update.