Portal mod`s not working

[Fennec]

I haw purchased portal from stem, and downloaded portal prelude (mod), portal prelude haw an automatic installer, so when installed it should run ok, but when i run it, it is only a white screne with the sounds from the opening credit. When the sound are fhinised the game stops and turnes off. what can i do to get it working?
ps. all the mods i install to portal goes like this

[Nick_NT]

You will have to go to SteamApps>sourcemods>Portal Prelude>gameinfo then copy this in the link: http://pastebin.com/yC0h42RW then replace the original gameinfo then save it and then your good! NOTE: if you see the loading screen messed up, thats ok.

[Fennec]

thanks you are a game saver