OK, this issue is known and will be fixed in the upcoming 7.1 version.
In the meantime, we can try to use AdwCleaner in Safe Mode. It works sometimes.
Here is how you can boot Windows 7 in Safe Mode : https://www.howtogeek.com/howto/windows-vista/force-windows-to-boot-into-safe-mode-without-using-the-f8-key/
Then, just launch AdwCleaner again and do a scan/clean.