Cant Access Applicatoin GUI Remotely (SSH)

Greetings!

Theres an application in my RHEL 6 server that has a GUI (which we'd like to use). When I run the AppGui.sh is says it needs Server X11.

I know its gotta do something with X server (and I installed it).I found some tutorial for auto configuration and then I was supposed to access the server with "ssh -X myid@serverip" but it does nothing.(did this from putty)

What can I do to access this application's GUI remotely from a Windows Machine?

Thanks in advance!