How can I install TightVnc via remote command prompt? I'm running windows 2003 and I dont have any access in my rdp .
You could use Gencontrol (free one-shot VNC utility) to get on that box and then install from the GUI.
You could also attempt to open up the TightVNC executable to see if it's run by a .msi file. That should enable you to run your install remotely via PSExec.