Error attempting install PMDG 777-300ER expansion pack

Dear PMDG,

Due to a system problem I had to perform a total new FSX installation. The T7-200 installed correctly and working normally but attempting to add the T7-330ER expansion I get the following message,

Quote: The setup has detected that version 1.10.6155 of the PMDG 777-300ER Expansion is already installed.

             This setup installs an earlier version of the 777-300ER (1.10.6061)

             You will have to uninstall previous version before installing this version.Unquote.

When attempting to uninstall by means of Windows Control Panel I get the following message.

Quote: An error (-5005:0x80070002) has occurred running this setup.Unquote.

Hoping to receive your favourable answer and solution soonest.

Kind regards

Dirk