Uninstall causing problems - avast free anti-virus

Here’s my issue, I’m trying to uninstall the Free version of Avast Anti-virus on a Windows 10 operating system but no method of uninstall seems to completely remove the program. I’ve used both the avast uninstall tool and my computers normal uninstall. After the uninstaller’s are complete I have issues opening other programs. For example, after I attempt to remove Avast and click to open Itunes I get an error message telling me that the disk is locked and I can’t open my music library folder. Please help, and thank you.

Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions…!!)