Complete freeze of computer when downloading games

[Asuna]

Seemingly randomly when I download any games (wow, planetside2, tf2, wot, warthunder to name a few) my computer will freeze. The sound will freeze on the note its on and repeat indefinitely, the mouse and keyboard stop responding, and the monitor is also frozen. Forcing a restart seems to be the only way to return my computer to a usable state. I have always had this problem since I got my computer brand new in the mail.

Specs:
Windows 7 Home Premium 64bit
Service pack 1

Alienware X51 R2

Intel(R) Core(TM) i5-4440
CPU @ 3.10GHz

8.00GB Ram

GeForce GTX 645
344.11 driver
1080, 60Hz


Please help! (It happened again while I was making this post, thank god google remembered what I had wrote)

 

[Tmagic650]

Is this a Dell Alienware X51 R2?

 

[Asuna]

Yes

 

[Tmagic650]

Test the hard drive by going to Computer, right-click on the C drive. Select Properties, Tools, Check Now. Put a check mark in both boxes to set a disk check on the next start up