Lolz, omfg with me... I tried to get ESF to Steam, and so i uninstalled the whole Half-Life to be installed again in the Steam folder. Well, after i had uninstalled, i remembered that i had sold my copy of Half-Life to my friend... And this friend lives quite far away from me, and i meet him only a couple of times a year. And now i cant play ESF, 'coz i dont have half-life anymore. Goddammit. You should congratulate me!