Bit of a disclaimer, I'm not all that great when it comes to hardware, but I think I have an idea or two of what might be going on.
When was the last time you ran any anti-malware on your computer? Also, what do you use?
Your specs don't look all that bad, but if is a hardware issue, I would assume it might be the video card. I know the memory on there is a little low (2 gigs if i am correct) and the clock speed isn't the greatest either.
Another possible issue that (in my opinion) is a little less likely, is your RAM, which can be fixed here http://downloadmoreram.com/ (jk, I'm hoping you know that's fake). This might be a bit of a cheaper fix, but my main worry is that if you do get more ram, it will bottle-neck at your gpu. I run 8 gigs, and don't have too many issues with it, but it is a bit of a cheaper fix that couldn't really hurt too much to upgrade.
Again, I would run some scans for malware with AVG, and Avira, as this MIGHT be the issue, but if I had to take a guess, I would have to think it is your video card. Hope this helps and good luck