[HELP]CS 1.6

Hi guys i want tell me about this problem i and my friend downloading cs 1.6 non steam i login perfect but my friend have problem his problem is when he run cs.exe there write your memory less than 15 mb wtf he has 4 gb ram and i am have 2 gb ram he terminate programs like skype for more ram but again the same :S can you explain me what he must do to dont have this problem or give me link to download a version counter strike 1.6 better?