System Thread Exception Not Handled (igdkmd64.sys)

(Note: I have been updating from Windows 7 to Windows 10).

I have installed Windows 10 on a laptop and two PC’s All went well but today (3 days later) my main PC when switch this morning on gave me the following. (Fig1)

System Thread Exception Not Handled (igdkmd64.sys)

I looked at all the options offered in Troubleshoot > Advanced options, but none of the simple things helped.

The only thing I did before closing down yesterday was I deleted three unwanted...

System Thread Exception Not Handled (igdkmd64.sys)