My laptop is a Dell Inspiron 15 5567 Windows 10 Home

I have a problem with igfxext.exe, which on my PC is located:

"C:\Windows\System32\DriverStore\FileRepository\igdlh64.inf_amd64_af02201d084badde\igfxext.exe" size 353,048 bytes

I had a a problem maintaining a connection in Google meet, something that I had often done before. Looking in Process Explorer I noticed that 100% of the CPU time was being used, MsMpEng.exe (Windows Defender) was taking 25-50% and igfxext.exe had multiple instances (4-10), continually being created and killed.

I suspended MsMpEng.exe and the CPU settled down and there was one instance of igfxext.exe. As soon as I resumed MsMpEng.exe the problem reoccured.

I installed AVG to test if it was a MsMpEng.exe problem but the same thing happened.

I ran MalwareBytes and that did not find any problem.

I did Google for problems and the one useful site suggested that if it is in a subfolder then it is potentially dangerous. The file is digitally signed by Intel and Microsoft.

I have tried twice to update the drivers using the Dell web site but that hung both times.

I have effected a sort of solution, by hacking the registry. I tried copying/deleting igfxext.exe but both gave me 'Access Denied' I edited the registry entry, changing the name of the executable. This solved the problem and I don't appear to have lossed any functionality.

Can anyone else had similar problems? Can anyone give me anymore information?