First of all, restart your computer and see if the issue is fixed or not. If the problem was occurring due to a minor glitch, it will be fixed automatically after restarting your computer. Also, ...

Close all open applications and documents. Choose your operating system and click the Download button to begin. When the security dialog appears, choose to either Run or Save the installation file.

I just got the Logitech Performance MX and I've been hesitating about installing the Logitech drivers because in the past I've heard people have had issues with them. What's the state of the drivers ...