Resolved! - My yellow shield on tray icon - You are unprotected problem.
I ran Smart Scan (which took a long time) and turned off the PC when it completed (unfortunately did
not think to check the AVAST tray icon before turning PC off). Turned PC back on. Rebooted Windows (XP), and the tray icon was back to normal (Your system is secured. All shields are on). This in spite of the fact that “Smart Scan” reported no problems found. Hope this is helpful.
I have followed the link from Igor but I just get a screen as in attached pic. As I am not a computer expert I really don’t know what to do next as there are no instructions on the page.
Sorry but I run Windows 10 so it is not Internet Explorer, it is Windows Edge. However I refuse to run Microsoft browsers (IE or Edge) as I am not convinced of their security and only use Chrome so this i not of any help at all… thanks for trying to help. It still all looks a little beyond someone of my computer abilities anyway.
The instruction hold true regardless of the browser used.
From a security standpoint, all major browsers are equally secure or insecure.
Features usually determine user preference.
Have tried to open the page to enble me to copy the file but it really isn’t accepting it. I followed the link from Igor and saw the screen shots but I am unable to do it. I’m sorry but I am not a techie.
If this is of any use I have found that the occasions where Avast switches itself off is when I have accessed my Yahoo Mail. There is a problem flagged up that a folder eg Inbox, Sent, etc cannot be accessed. I then check my Avast status and find that it has switched off. This does not happen everytime I access Yahoo Mail but every time there has been a problem accessing a Yahoo Mail folder that is when Avast switches itself off. It doesn’t seem to switch itself off at any other timeor when accessing any other websites. I did a test and didn’t access Yahoo Mail at all yesterday and Avast didn’t switch off. As soon as i accessed Yahoo mail today there was a problem and Avast switched itself off.
Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed.
If that doesn’t work proceed with the following Clean Install of Avast: https://goo.gl/4Ptzkf
I know this thread is a few months old but I just wanted to add how I fixed my avast problem (can’t enable shields). My problem started today and after a couple hours of trying to figure it out (multiple cleans/fixes uninstalls reinstalls 20 reboots), I went into add/remove programs. There are 2 programs there “xna 3.1” and “xna 4.0”. I uninstalled xna 4.0, rebooted, and my avast works just fine now. Hope that might help anyone having the same problem.