|'AV8 was trying to download'|
I presume you mean AVG 8?
If so, tap f8 on startup and choose safe mode. Once in safe mode try a system restore back to before AVG.
Then I would usggest you uninstall AVG, then download Avast Free and try that...much better AV and better protection with no scheduled scans
Some HELP in posting on Computing.net plus free progs and instructions Cheers