You say the system is a dedicated DAW, so there are seldom any tasks done on it besides Cakewalk, therefore difficult to determine whether it's a hardware or driver issue.
The following questions are my standard PC troubleshooting queries.
The system never crashes when it's just sitting there at idle?
Are you up to date with your video driver? Is this a recent issue? If so, can you recall anything changing about your config right before it started happening?
Have you checked your Windows Update to see if it installed a new driver for anything?
Do you know how to check your System Logs? If so, do they show anything?
If this is a recent development, do you have a Restore Point you can revert to from before the problem started happening?
The above will help you eliminate the OS and hardware as the source of the problem. I've had troubles with video cards and drivers and my DAW's. Plug-ins love to use those fancy GUI's, and I think some of them may even use the GPU for processing. All the redrawing and stuff we do is taxing on the 2D capability of a video card, and video cards tend to be optimized for 3D. The nVidia cards pay attention to 2D speed, especially the Quadros. That's what they use for the big displays at airports and such.
So make sure your video card driver is up to date, or if it is, maybe roll it back or try the Microsoft one instead of the vendor one.