I have been using avast for the past four years, and can personally say that i have recommended the migration of most of my friends...(numbering atleast a couple of hundred) and god knows how many people they recommended it too, being satisfied with it.
My issue is, when Avast 5 came out, (long overdue) and had all the looks of being a champ, there are a few niggling issues with it that needs working out, for example, in my computer, after using avast for a few days straight, a big red "X" shows up on the icon,scrolling over it theres a message saying SYSTEM IS UNSECURED and it doesnt work anymore. I have tried reinstalling it like a dozen times, but to no avail. :'(
I use, Spybot S and D, along with USB disk security 5, and recently been working with Immunet Protect for an additional layer of security. Windows XP pro, no firewall. P4 512 Mb ram, (browsers, Chrome, Opera). I do not understand this issue. Please someone help me out. Is this a known issue? What may be the problem?