N5.5.2 = No program installed......??

Hi,

if you come across this kind of situation with installing an update and the installer claiming the software is not installed you can try the following tool from Microsoft:
http://support.microsoft.com/mats/program_install_and_uninstall/en-us

Apparently sometimes an entry in the Windows installer database might be missing or is corrupted leading to such behaviour. Should be helpful for other software as well.

Best,
Sebastian