Multiple SAP SIDs on single Physical machine. Windows with Oracle

Hi

I need bit information regarding this issue,

I am installing 3 SIDs on single machine

1. ECC 6.0 EHP4

2. Netweaver PI.

3. Netweaver MI.

Operating System : Wiindows 2008 Server.

Database: Oracleg 10.2.0.4 .

All done successfuly however i am not able to start all three servers at the same time, only one can be up at a single time.

As per you recomendation

1. I have 3 diffrent SIDs and unique instance number.

2. However only single Listner there on my machine.

2. Oracle Home is also a single.

Can you please advise what could be the exact Couse of my issue.

Regards

Gagan