NOTE: If buttons or keys respond incorrectly in a particular program, verify if the problem is specific to the software by testing in other programs. Right click on Logitech KHAL Main Process and Logitech SetPoint Event. Here’s how I solved the problem with Windows 8 (if you’re running Win7, give it a try and let me know if it works): Open Task Manager with CTRL-SHIFT-ESC and select Processes. If a single-click always double-clicks, check the settings (Windows mouse settings and/or in Logitech SetPoint/Options/G HUB/Control Center/Gaming Software) to verify if the button is set to Single Click is Double Click. Even then, Logitech can’t get their Setpoint software to run with mouse and keyboard tabs.If the problem stays with the same button it is a hardware issue. If the problem moves to the new button it is a software setting or application issue and hardware troubleshooting cannot resolve it. If you’re not sure if the problem is a hardware or software issue, try switching the buttons in the settings (left click becomes right click and right click becomes left click).Windows only - if it works on a different computer, then the issue might be related to a USB chipset driver. If it makes a difference, try updating the motherboard USB chipset driver. Windows only - try a different USB port.Unpair/repair or disconnect/reconnect hardware.Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch or something similar.Clean the button/key with compressed air.Button/key/control gets stuck or responds intermittently.I have an old G700 mouse that I wanted to start using again, in a Windows 7 圆4 laptop. Repeating or strange characters when typing on the keyboard Logitech Setpoint not detecting G700 mouse.Single-click results in double-click (mice and pointers).