I have already SQL2k installed on my machine then I installed SQL2k5 on the same machine but it seems I have got only Management Stadio. None of 2k5 functionalities works and new syntaxes fails. What's wrong with? Had i miss anything during installation process.
if all you installed was SSMS, that's only the client tools (replacements for EM/QA/etc). You need to install the relational server to get the 2k5 features. and as harsh says, if your 2k instance is the default instance, you'll have to make the 2k5 instance a named instance.
Yes, i guess its worng, if you are installing 2 servers on the same machine then you have give the second server as named instance... so that SQL SErver can rectify by the instance name and then connect to it.