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Sometimes the removal utilities need to delete some additional items that need one additional reboot for completion. This is not always the case, but sometimes it is.
The old security tools may be conflicting with Avast, but I would say that the most important thing would be to get rid of any potential malware.
In the partial list of removal utilities for security tools, there are also links for additional info for each one.
You won’t get any insults from us. Nobody was born with knowledge built in.
Keep following the instructions and reading the relevant info before running the removal utilities. A reboot is usually recommended after the tools are ran.
Keep posting feedback so we can help in case it is necessary.