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On several computers here at home, I have Avast Free Antivirus Installed.I configured the program to automatically run a full virus scan, each night.Each morning I check the computers, it shows that Avast did a 99% scan, and then is has a Detail button.When I click the button, it starts, the scan all over again.But when I check the scan history, it shows the results as though it was completed.I have uninstalled and reinstalled the program twice, and it does the same thing…Any comments please??

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Please (re)search before posting.
It is a known bug.

And next time post in the correct forum > https://forum.avast.com/index.php?board=2.0

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I configured the program to automatically run a [b]full virus scan, each night[/b]
There is no need for this frequent scan

All AV (with one exception) have realtime protection/monitoring, meaning evrything that goes on in your computer when it is on is checked/scanned by your antivirus in realtime

[b]Real-time protection[/b] Real-time protection, on-access scanning, background guard, resident shield, autoprotect, and other synonyms refer to the automatic protection provided by most antivirus, anti-spyware, and other anti-malware programs. This monitors computer systems for suspicious activity such as computer viruses, spyware, adware, and other malicious objects in 'real-time', in other words while data loaded into the computer's active memory: when inserting a CD, opening an email, or browsing the web, or when a file already on the computer is opened or executed