I just installed Avast 5.0, I had 4.8. Once my computer restarted, not one of my programs showed up in the system tray, and I could not access any of them through start, programs, either. Couldn't go on the internet. Couldn't even do a system restore. I had to restart in safe mode so I could restore before the installation. Now Avast 4.8 isn't working at all, and I have no anti-virus program running because of this.
I have Windows XP SP3.
I am afraid to try installing Avast 5.0 again, I hope there is another free anti-virus program out there. I loved Avast, but I don't know what they did with this new version!