Virual Guitarist / Halion String Edition Vol. 1

Hi,

Has anyone an idea how I can corectly install Virtual Guitarist I and Halion String Edition Vol.1 without gettting the error message " There are other activated processes which disturb the installation process. Please restart the computer and repeat the installation" on WIN 7-64 bit by using Cubase 6?

Many thanks in advacne.

Best regards

Björn