Mele, I'm getting somewhat lost. We're moving in circles here.
Do I understand it correctly that the problem only starts happening when avast encounters the Avira file (which it considers a Trojan)? I.e. before that, everything is just fine?
Now, the CPU load may be related to avast moving the Avira file to the Virus Chest. How big is the Avira file?
The problem is now everywhere. I went to full screen view and then right clicked on the desktop and chose "Personalize" so I could fix the icon size in the systray as for some reason they get huge anytime I go to full screen view. I use classic style (no Aero) so I needed to get into the Menu and change the size of Caption Buttons. I have to do this anytime I make Windows 7 full screen. Avast took forever to scan the files...at 100% CPU usage. I am sitting there for two minutes because Win 7 can't give me Windows Colors to click on to get to that menu! All because Avast hogs the CPU constantly and is the slowest AV I have ever used!
Avast should not hog the CPU and should not be so extremely slow. It cripples both Vista and Win 7. Damn shame as I really like Avast but it doesn't like my computers. I disabled the behavioral shield and that made no difference. It's the real time scanner that is the problem. Maybe if I don't have it set to scan all files but use the smart extensions that would help, but rather than do that I would prefer to find an AV that is not so heavy. These days that means Avira only I guess and Avira 10 has a major change I will not accept.
It is not my only having 1GB RAM for this computer. I have plenty of unused RAM. It is the very frequent hogging of the CPU at 100% by Avast that is the problem.