OK.so I see you are using SAPgui for Windows 7,20 which is not supported anymore ;(
You must use 7.30 or 7.40 with Windows 8, and since the 7.30 support ends next month, it makes more sense to try 7.40 gui.
With this version of the SAPGui there is also the SAP SSO Login client.
Regards,
Jude