PC Keeps freezing ever time I use it

It's really frustrating me, it has been freezing for a month now, luckily I haven't needed it, but I do now. It freezes at random times. if I leave it, it will stay on for hours, but it usually freezes after 5 minutes of regular internet use. It first froze while I was on skype using my phone as a webcam.

I have done a full system restore, re-installed windows, a short memtest, checked temps as its frozen ( http://I.imgur.com/06irpdz.jpg ). tried using just HDD or just SSD. and carried out virus scans, but I'm all out of ideas, and I have plenty of uni work to get done this week.

If it helps My event viewer shows this -> http://I.imgur.com/STEX4gf.jpg

is it worth noting that under task manager my C: disk is at max most of the time?

I have also tried different ram and gpu, same issue.

Thanks in advance
 
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