AVG by Grisoft on Vista and Side By Side Incorrect Configuration Error

AVG running on Windows Vista gave me an error today. Complained that my side by side configuration was incorrect or something and I had a strange thing happen. I could no longer download files in Mozilla Firefox nor Internet Explorer. I would click on a link, the download would progress but would never place the end file where I saved it to. This was happening in both browsers. I couldn't find data on this exact error, only on how side by side was supposed to provide a new level of software compatibility. Bravo Microsoft.

I found a lot of chatter on google about it, and tried some suggestions, but then started thinking. It's time I try another tool. My solution, uninstall AVG, and install Avast. I like it so far but haven't gotten into it enough to tell how Avast anti virus compares to Grisofts AVG. I've suggested AVG for years, but it looks like I may need to reassess All my security tools. Spybot and Adaware have gotten some negative press lately, perhaps it's time I move on from my favorite trio and consider others. Ive also heard Clam AV is good, but have never installed so can't comment.

UPDATE:
I have been using Avast more and more lately and it's an excellent anti-virus app. One thing I love is that when you install it, it will ask about a scan for viruses on the next startup. It does this really early in the boot process, about the point a chkdsk would start. The benefit is, if your computer is already infected with a virus, it will perform it's first scan with no services / viruses running. It also has real time file scanning and a lot of options for scanning. It includes an email scanning function. Has a voice option to speak to you when a potential virus is being accessed. The best part is it seems to be more compatible with Vista. Vista hasn't complained a bit since the install. Really nice App. The home addition of Avast is free antivirus, with free anti virus updates.