Still doesn't work :-(

I have added back the "Product GUID" and the "Upgrade GUID" (and "Product Version" is set to 1). Now when I install it, it does create an entry in the Control Panel UNINSTALL PROGRAMS list. (it didn't without the GUID).

I've tried uninstalling via control panel, and also by calling the uninstall.exe directly. In both cases the result is the same as before. The installed programs and folder are not removed. I'm using Windows 8.0

It works on your computer but not on mine.
This is not an important issue (I can always get the client to manually delete the folder as this is a one-off temporary install). But I'd like to find out what I'm doing wrong so I get future install/uninstall projects correct.

Any more things I can try :-)