Windows refreshing constantly..please help

Im using 64 bit home premium and it used to work fine till a month or two ago. The computer constantly refreshes ever 1 - 2 minutes, as a result whatever program im using at the time refreshes too. This stops me typing on Word, it causes whatever game i might be playing to crash to the taskbar, i cn longer watch full screen videos online as they too are minimized instantly. Anti virus scan comes up negative for malware and my nvidea 630M GPU has been updated with the latest driver so has my intel hd4000 graphics. I dont know wat else to do, please help me..

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