Some games freezing on laptop

Hello
I am having a strange issue with my laptop/windows.
WoW and recently TF2 have started freezing (sound freezes as well). Sometimes the computer freezes completely and sometimes the game closes but it continues to appear in task manager. I can't close it using "end task" and when I try to restart my computer/switch it off it does not switch of completely and I have to hold the button.
I am having trouble understanding why this happens. Here are some conclusions I have come to:
-I am using a cooling pad and my computer is completely cold, the fan isn't running at full speed so it shouldn't be from overheating.
-I have latest drivers
-I have no extra program running while playing
-Only WoW and TF2 crash

I managed to "fix" wow by playing it in DX8 and now it crashes very rarely. TF2 crashes after 10-15 minutes of play then I restart and continue playing without a problem.

I would greatly appreciate any help because I have no idea what can this be cause by
Thanks

I bought it last year ~June. I haven't reinstalled. The computer works absolutely fine and I am taking good care of it, regular cleaning and maintenance. I don't have much stuff installed. Here is some info I found:

Source
hl2.exe

Summary
Stopped working

Date
‎31/‎05/‎2012 20:02

Status
Report sent

Description
Faulting Application Path: [REMOVED]
2\hl2.exe

Problem signature
Problem Event Name: BEX
Application Name: hl2.exe
Application Version: 0.0.0.0
Application Timestamp: 4f6cfb24
Fault Module Name: filesystem_steam.dll_unloaded
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4fb52e6c
Exception Offset: 6c1be36c
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 2057
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Extra information about the problem
Bucket ID: 2984303824

I also have linux dualbooted.

shmO said:

I think that you should uninstall steam as well as TF2 and reinstall them. If you have already tried that let me know and ill see whatelse i can find out.

Note: You should uninstall Half-life 2 if you have it as a steam game as well.

Yes I have HL2 and other steam games. I will do that, but may I ask how will this help, because as I have said it's not only tf2.

Thanks

Also I found this:

Source
Windows

Summary
Video hardware error

Date
‎29/‎04/‎2012 16:04

Status
Report sent

Description
A problem with your video hardware caused Windows to stop working correctly.

Problem signature
Problem Event Name: LiveKernelEvent
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 2057

Extra information about the problem
BCCode: 117
BCP1: FFFFFA800F4FA4E0
BCP2: FFFFF8800823D500
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1
Bucket ID: X64_0x117_Tdr:3_TdrVTR:1_IMAGE_igdkmd64.sys
Server information: 4b0cae8a-c60d-44e7-871d-b3492b13c6bb

shmO said:

Summary
Video hardware error

Date
‎29/‎04/‎2012 16:04

Status
Report sent

Description
A problem with your video hardware caused Windows to stop working correctly.

It pretty much tells you what the issue is right there. Video Hardware. Is your videocard onboard?

Note: The first error that you posted was to the fact that HL had stopped responding or working correctly.. I think that it could be due in large part to the fact that the second error report you posted was pointing to the fact of the Video Hardware Error. If your Video hardware isnt responding or working correctly that could be the reason why the game or games continue to crash? If your videocard isnt onboard please list it for me. Have you tried running the game in any diffrent video settings to see if the game still crashes? Like OpenGL vs DX ect..? Lemme know

NVIDIA GeForce GT 450M
Drivers are up to date, I am playing WoW in OpenGL (my mistake it's not dx8) and it crashes extremely rarely as opposed to frequent crashing with normal settings. I will try playing TF2 in OpenGL as well.

Also as I said D3 isn't crashing (or hasn't crashed yet...). I may try some other games as well. I am also using 3D application like 3DS Max and it hasn't crashed there.

Dell XPS 15 Laptop Details | Dell UK
I think I might know why this happens. I used "diskmgmt" to get some free space from one of my drive on windows, so that I can install linux. It may have scrambled things up. Will it help if I delete the Linux partition and add it back to the old partitions or will a game reinstall help as well (I will try with a game reinstall nevertheless).

https://i.imgur.com/5XD5h.png