I have a laptop Dell N5110 and the left/right mouse button suddenly stopped working. I tried reinstalling the drivers with no successful results. Everything else on the touchpad seems to be working as well as all buttons on the USB mouse
It seems like an issue with the touchpad as the USB mouse is working fine . However, please update the BIOS on the system using the link below to check if it fixes the issue.
#IWork4DellOrder StatusDrivers and Manuals