1 os startup slow,update virus database on os startup is the cause,hope delay the update after 3-5 minite after os started~
2 do not include vc++2008 in installer,today VC++08 is widely in os,installer cause 2 VC++08s in my os,after every intalltion,I have to del one vc++08. some one may need vc++08,then installer can live download from microsoft.
If your computer is always connected to the Net there is absolutely no reason to ever turn if off unless you have to do a cold reboot which should be very rare.
If your computer is connected to the Net using dial-up then just set the updates to manual.
You can set Avast to wake the computer from sleep mode if the time for a scheduled scan has come.
If a change was to be made with updates I would suggest to add the feature to be able to wake the computer once a day at a pre-selected times to apply any updates that may be available.