Join Date: Aug 2006
Location: DCA / WAS
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Posts: 9,388
I had a similar problem on one computer (older netbook with XP) when attempting to upgrade Eset Security. The resolution was to fully de-install and then reinstall the program, which resolved the issue.
Having said that, I think before I did the de-install/reinstall thing I would do the following:
1) download & run MalwareBytes to identify malware & help resolve the issue;
2) run an online scan from McAfee (I think Symantec may also have an online scanner).
Unfortunately, no program catches all the malware, and one thing that the newer malware does is to disable the functioning of anti-virus programs.
Also, as ctuttle noted, sometimes the programs will conflict with each other.