After starting up the pc I can left click one time after signing in, I know this because I can open the start menu. But after I click once, all of the buttons on my mouse stop responding. The mouse still moves around on the screen, and the scroll wheel works fine, but clicking and right clicking does absolutely nothing. I can restart the computer but the same thing happens. Everything was fine until I came back from a trip that lasted a few days. Any help would be appreciated.