Cannot load models

[specialmax]

Every time I play any HL2 mod or HL2 itself it says cannot open model: alyx and stuff like that help!

 

[Ames]

Have you tried validating the files yet?

http://steampowered.custhelp.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=282