I was having the same problem, but I just did what you suggested and that immediately sorted my problem. Thanks!
Although I must say this … when I phoned up Avast they told me that inspite of my 3 month old Computer performing really well and Avast Full System Scan coming up CLEAN with 0 infections … that my computer was corrupted and I must pay them £129 to fix the problem!!!
I thought that Avast no longer had iyogi dealing with their customers!?! Very concerning!!