This article will help you to reinstall your G DATA Business solution.
Your Login Credentials will be needed in order to reactivate the ManagementServer.
If you don't know where to find them, consult the following article:
Below, you will find links to the different articles covering the removal and installation of the various components of G DATA Business:
A. G DATA ManagementServer
B. G DATA Security Client (antivirus client program)