Basically it's happened a few times but today it happened again and I'm fed up because I have no idea what might be causing it. I was playing a game via Steam, I had Skype running in the background and Google chrome. Everything will be running smoothly until sometimes I change tabs or click on a different window on the taskbar and it will just stop working, I can right click it and see the options task manager etc but I am unable to check Skype or click back on Steam or even Google chrome, the window doesn't pop up or change to that window it's just stuck. I've tried restarting my PC even system restoring and it stays the same when I start Skype/Steam/Google Chrome, the window still doesn't pop up yet remains on my taskbar. I've had to refresh/reset my PC four times the past three days and it's becoming a hassle. Any suggestions?