Hi Thomas,

This freezing may happen due to your graphics card getting overheated while you're using. To resolve this issue, you can try the below mentioned fixes.

Fix 1: Uninstall the graphics card driver from Device Manager.

1. Open Device Manager by clicking the Start button, clicking Control Panel, clicking System and Maintenance, and then clicking Device Manager.
2. In Device Manager, locate the display adapter and then double-click the device name.
3. Click the Driver tab, and then click uninstall Driver (including the driver software) and follow the instructions.
4. Do the same in Programs and Features look for anything related to NVIDIA and uninstall it as well.
5. Download and install the graphics card driver from NVIDIA support site
6. Here's the link for download: nvidia.com/download/index.aspx
7. After the reboot make sure that your games are set to use NVIDIA graphics card.
8. Open NVIDIA Control Panel and select Manage 3D settings.
9. Under 3D settings click on the Program Settings tab then select the program you wanto to choose a graphics card from the drop down list. In your case your games.
10. Lastly, Select the "preferred graphics processor" to High-performance NVIDIA processor.

Fix 2: Use FRAPS
You can use FRAPS utility to measure your actual frame rate.
Launch FRAPS before starting up your game, and look at the FPS figure it provides when you're in the game. Any time that little yellow counter drops below around 25-30 FPS or so, especially in fast-paced games, you're going to feel some amount of graphics lag.

Fix 3: Check for known issues and updates for the game.
Most software problems are not unique, and when you encounter one, it's likely that other people are having the same problem.
Frequently, game publishers will issue updates that contain fixes to known problems.
To learn more about known issues and get updates for games and devices, visit the game publisher's or device manufacturer's website.

Fix 4: Update Microsoft DirectX
It helps to create the special visual and audio effects that come with games. Many games rely on DirectX to help get more performance from your computer. Make sure that you have the latest version of DirectX so that you can take advantage of all of the latest features.

Fix 5: Adjust game's settings.
Most games have settings that allow you to control the resolution and level of detail that's displayed, as well as the quality of the audio.

I hope this helps in getting the issue resolved.

Regards,
Lokesh