Windows_Zertifikatsüberprüfung
Checking for Certifikate Windows VISTA/7/8/10
-
Press Windows-Key + R, type in certmgr.msc and press OK.
-
Click the arrow next to Vertrauenswürdige Stammzertifizierungsstellen, click on Zertifikate and search for T-Telesec GlobalRoot Class 2.
-
If you can not find the certificate you have to do
A manual for installing the certificate can be found here.