I uninstalled AVG with Absolute uninstaller, then installed security update, then rebooted, as it was installing them on shut down, it said: 'Failure configuring windows update, reverting changes'. Then it reverted and logged into windows and got the same message as in the first post. Above the message thats in the first post it says; 'explorer.exe - system error'. I don't use IE, so I assume it means windows explorer.
A custom theme? Is that in the personalise/aero theme bit? If so, then yes I made a led zeppelin one. Should I just use a basic windows one at the moment?