Hi guys, thanks for the responses much appreciated
Yoyo> this happens with all media files regardless of resolution in videos, regardless of programs even in YouTube through a browser, it even happens when playing music through WMP. Really strange
Layback>Its a Dell Inspiron N5030 Laptop mate
I let it continue the stress test overnight if this has any relevance at all and the results after approx 9 hours show no obvious signs of any errors its a strange one, is there no software fix for these kind of things?