Problem installing .NET connector 6.4.4 (1 reply)

Tried to install the MySQL .NET connector version 6.4.4
Installer complains that an older version already exists on the system.
No older version can be found in the "Installed Programs", so I can also not uninstall it.

Installed now several older versions and uninstalled them also.
Still no go with the 6.4.4 installation.
Also removed ALL other MySQL Stuff like the server and the administrator tools.
Also that didn't help.

How can I install this connector???
Please help!!

OS: Win7 ultimate 64bit