I tried to upgrade my AVG Anti-Virus Free Edition installation, but halfway the installation I had to stop Windows (my computer was not responding) and now the AVG User Interface says "There are no active components".
So I tried a new installation but the program keeps on giving errors. I also tried to uninstall the current installation (uninstall and also repair) but I keep getting error messages:

Can anybody help me? How can I remove the current installation?
I'm using Windows Vista Business edition.