Even I have Avg 8.5 free version. It is working good for last 2+ years in my Vista system. But it seems if you have Windows 7, then there is a problem with Avg 9 free version. It might corrupt your network drivers (both wired and wireless). This happened with many windows 7 systems. Avg also blocking some port where wireless cards are trying to listen the wireless comm. So, just be careful if you are using Windows 7 and Avg 9 free version.