I was trying to install windows live essentials onto my computer running Windows 7 Professional. I tried both the 2011 and 2012 versions of the program. However, every time it finishes downloading and installing, a windows pops up telling me that it couldn't install the specified programs (Mail and Movie Maker) because another program is preventing it from working (Error Code:0x80070643). The only problem with this is that I have disabled all antivirus (Kaspersky AntiVirus) and Windows Firewall itself. I will not disable all startup programs because some of them are for my CPU and motherboard to work properly. I did disable some though, and it has not done anything. Windows is not of any help because they just say to uninstall my antivirus and install Windows Security Essentials which I do not want. Help for this would be greatly appreciated. Thanks!