Citrix installation on 2003 server

Hi guys

I'm trying to install citrix presentation server 4.0 on windows 2003 server, installation goes fine until I get to a screen where I get an error code 10001(while installing presentation server module). The installation asks me whether to carry on installing other components and if I click yes then the software installs all components like licencing server, web interface, but leaves away presentation server which is the most important thing. I have searched the internet and I found out somewhere that there are some compatiblity issues between terminal server in 2003 & presentation server. Is that right? If not, could anybody suggest where I'm going wrong?

Regards