Some users reported that their pcmtuner was working fine on Win7 but an error “Object reference not set to an instance of an object” occurred after update system. Here’s the working solution from iecutool.com and our customers.
It’s a problem with windows last update.
Try restore windows. Your windows done an update, try do roll back to previous.
If don’t work install your PC with system update no more than 2019.
Solution 3: Customer solution.
No restoration!!! No any reinstall.
Go to Control Panel->Programs and feature
Find Microsoft Edge WebView2 Runtime
Uninstall Microsoft Edge WebView2 Runtime
Install the old version edge web view in link mega.
pcmtuner 1.2.7 now is working fine.