It simply won't install on 64 bit Windows 7 and that is why people are asking about this. I tried several times unsuccessfully...it doesn't say that is why it won't install, but I finally figured it out. I searched for a 64 bit version and looked at the link it gave me when the installations failed, but they gave no helpful information...just took me back to the site for downloading. I needed to remove a trojan, so I tried Avast since someone on one of the forums I was searching suggested it. It looked like it installed, but it didn't. When I right clicked the icon to look at compatibility, it said it was a non-compatible product. Then I went to ESET and was able to install it and remove the trojan, but that is a temporary fix since it is a 30 day evaluation version. Maybe the staff at AVG should investigate this instead of just telling people it will work, because it won't.