Windows 7: Intermittent Application Freezing - Resolves itself in 2-5min

Hey there!

***EDIT***

DSKCHK is being run upon boot now. It says it is deleting corrupt portions and repairing disk sectors but I am still getting the freezing, its just less severe now.

I am also unable to shut down the computer without doing a hard shutdown.

I've had my PC for around 2 years now but just recently I have been having 'intermittent freezing'. It will start when I am browsing the web, playing a game or just looking around my folders. I reinstalled windows about 3 weeks ago and all has been fine until now - when the error is returning.



At first, one application will lock up. For 30 seconds or so, I will be able to minimize that window and explore other windows. After that, the freezing will spread to other applications I have open until the point where I can move my mouse around and click things but nothing happens. After about a period between 2-5 mins, everything 'unfreezes' at once, and all of the commands or things I have clicked on (during the time the PC locked up) open at the same time. It also disconnects me from any online connections (Games, Skype, Steam)

Thus I rarely get a BSOD -- although I got one mentioning memory mis-allocation a while back, but I didnt get the error code!

Specs:
Windows 7 x64bit
Intel Core-i5 2400 ~ 3.1GHz
4096MB RAM
GeForce GTX 460 SE ~ 2761MB
(Main Driver Model: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2 )
V. 8.17.13.142 - WDDM 1.1

Please help!

Also, I think it may be RAM issue! Or is something loose inside the case :c

***EDIT***

DSKCHK is being run upon boot now. It says it is deleting corrupt portions and repairing disk sectors but I am still getting the freezing, its just less severe now.