Cannot uninstall AntiVirus or dowload from the internet

you try again to instal it the same version it will ask to repair and uninstal go for repair

You might try restoring the system to a previous date. If you've done that and you still get the AVG error do a manual uninstall by deleting the program from your local hard drive (C:) then go into the registry using regedit(be careful doing this if you dont comfortable, then by all means do not attempt this step, you could possibly corrupt your operating system)type regedit in the "run" bar of the start menu . once opened search for AVG delete all of these strings, reboot and reinstall AVG. If this doesnt work we can go from there but this will most likley work.