Is ScanGuard for free good or dangerous?
I’ve never used it.
You might want to review
For further comments in the forum regarding Scanguard see https://answers.microsoft.com/en-us/search/search?SearchTerm=Scanguard+&IsSuggestedTerm=false&tab=&x=5&y=16&CurrentScope.ForumName=Protect&CurrentScope.Filter=&ContentTypeScope=#/Protect///1
And here's a discussion regarding Scanguard at Bleeping Computer: http://www.bleepingcomputer.com/forums/t/628976/suspect-scangaurd-security-suite/
Regards...