Resident Protection not functioning

I’ve installed Avast 4.6 Home Edition. All functions except Resident protection seem to be functioning. But, when I select Settings/Resident protection/Standard (or High)/Click OK, when I go back to Settings/Resident protection, the slider is always back again at Disabled. The scan tells me the system is clear of viruses now, but I still have this apparant malfunction. Anyone have any fixes or know what’s going on?

Hi and welcome ,
can you follow the steps in this thread http://forum.avast.com/index.php?topic=17928.0
report back if you are still having problems .

Did you boot after installing?
Which is your Windows? 98, Me, XP?
Do you use any other antivirus in your computer?

Can you try to repair your installation?
Go to Control Panel > Add/Remove programs > avast! antivirus > Remove. Then choose Repair function in the popup window (Repair). You must be connected to the internet while repairing.

If this does not help, can you uninstall / boot / install / boot again?