Graphics stuttering

Running the editor has been fine until today every 6 seconds it stutters when i go to play in editor when i walk every 6 seconds it stutters.Have done the basics reinstall drivers/check temp of cpu etc but to no avail.I have tried other editors and games i have i dont have a problem.
My specs intel i5_4670 3.40ghz/amd 7970/ 8.00gb ram/windows7 64 bit
Any ideas?

Worked fine thank you