Windows Server 2008 Install 2 Sybase instance

Hi everyone,

I want to install both SAP IDES ECC6 EHP7 Sybase 15.7 and SAP IDES CRM7 EHP2 Sybase 15.7 on the same Windows Server 2008 system. I have installed ECC6 EHP7 Sybase 15.7 already. However, when I was installing CRM7 EHP2 Sybase, i encountered problem at the stage of installing the database server. I tried several times and everytime I have the same problem.

Is it because only one Sybase instance can be installed on the same Windows Server 2008? Or it's because some other reasons. Thanks a lot.