pretty sure "Bitcoin Install Dir" should be C:\Program Files\Bitcoin
or, as droark suggested, navigate to C:\users\Andreas\AppData\Roaming\Armory and create a file "armoryqt.conf" containing the lines
satoshi-datadir="H:\Blockchain Core"
datadir="path to wherever you want armory to store its database"
(be sure to pay attention when saving it and not save it as armoryqt.conf.txt like I did)

and then uncheck that box "let armory etc."