Software Updater

Earlier today, I got a message to alert about an update for Foxit Reader software. The problem is that after update was completed, that program disappeared from the software updater list. Any suggestions? Thanks in advance.
Dear friends; please par-me for lack of detail; PC Acer X3810 Win7 Home Premium SP1 64 Bit OS Scans; YES, Avast Ver. 2014.9.0.2021 141006-1 Had some issues with newly updated Foxit but re-installed it and I’m working on that. Another scans like System, Virus, Spyware, Malware turned out Ok. Hope this helps.

Keep in mind that we can’t see your system.
You have to provide more information / details if you want to get help.
Without it we can only make a wild guess like:
You have a very naughty hobbit in your system ;D

Rebooted?
Ran a new scan for updates?
What os/sp?
What exact version of avast?
Any other problems (small or big)?

My guess would be a gremlin. ;D