I have HP desktop at my home. I use most of the software for my personal use. I donít have any problem with the working and performance of my device till last week. But after that I face some severe problem with my system. Actually my problem is I use Windows Vista as operating system and also try to use Win7 upgrade advisor and I unable to connect to Microsoft server for compatibility info. I canít understand the actual problem. Can anyone give me some suggestion for that? Please help me.