Have you tried positioning the cursor over what you want to Right Click, and instead of doing so, hit Shift F10.

Seems to work in most programs, though not all.

try using another mouse

I have replaced faulty switches on my PC's mouse a few times

John

If it's not a faulty mouse, might be:

• Another USB device (like a printer or external hard drive) that's gone rogue. Unplug them, reboot and try again
• A defective shell extension. This is when a program adds itself to the right-click menu and screws up. There's a downloadable utility called shellexview that can undo right click addons. Have a read of this link.
• Unlikely but worth updating the mouse device driver.

Dave

Unless they've changed it significantly for Win-10, you should be able to reach restore points and restore them using all left clicks (and assuming you can get to a proper desktop) by doing:

Start > settings >control-panel > system > system-protection > system-restore … then following the wizard

Edit: While you are in control panel, you might want to take a look at the mouse settings. It is possible to disable any button there – or otherwise re-assign it. Probably unlikely but we don't know the history …. It could also, potentially, be changed by malware.

Edited By Bandersnatch on 16/06/2017 22:39:25