Hey there!
My name is Ravi, and I am an independent advisor. I am happy to help you. :)
I understand how concerning it can be to get such a message from Avast.
It's quite common. Most of the time, it's better to ignore such messages from Avast. However, if you're really worried, you can run some scans using Windows commands to find any issues and fix them.
Try SFC and DISM scans.
You can run SFC Scan by following these steps:
1). On your keyboard, press the Windows logo key and R key at the same time to invoke the Run box.
2). Type cmd and press Shift+Ctrl+Enter together on your keyboard to open Command Prompt in the administrator mode.
3). Type sfc /scannow (or copy-paste) and press Enter. Then wait for the verification is 100% complete.
4). Restart your computer
After that, run this command: DISM.exe /Online /Cleanup-image /Restorehealth
You can check its details here: https://support.microsoft.com/en-us/topic/use-t...
Feel free to get in touch again if you have any additional questions.
Cheers,
Ravi