You should never have multiple antivirus programs installed since they will conflict with each other. See this post for more information as well as uninstall/cleanup util links Before Installing AVG 8.5 Free Edition
Disable Spybot's TeaTimer, Uninstall Ad-Aware ( known conflict ) disable Windows Defender,
Disable the Vista UAC and restart... make certain you log into Windows with an administrator user account...
Re-run the AVG Remover util to ensure it is able to work properly now that the conflicts and other utils that block Windows changes are disabled... if installing AVG... proceed.... re-enable the items disabled earlier.
Don't install other antivirus programs and its probably best to not install Ad-Aware considering the conflicts and slowdowns that have been reported when using it with AVG
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Plan A is always more effective when the device you are working on
understands that Plan B involves either a large hammer or screwdriver....