In the window that pops up type "cmd" and hit enter
Change directory into the bin directory under the GlobusToolkit directory that was created by the installation (i.e. >cd "C:\Program Files\GlobusToolkit\bin")
>grid-proxy-init
>grid-proxy-info
send the output to the atlas system administrators
only need to change the hostname to atlas1.atlas.aei.uni-hannover.de in the "Host" tab and delete all the entries in the "My Proxy" area of the "GSI Defauts" tab