It shouldn't be your PC.
When you go to Management Window -> Rooms -> room number, does it says "Room available"?
Viewing post in Why does this happens to me?
Yes, it said Room Available, but then i realized that i have a saved game from the alpha 3, and the game works like it should work, i dont know what the problem was but now im playing perfectly in my other save, i hope that doesnt happens to anyone and thanks for your help, although i didnt fixed the problem. Sorry if i made any mistake, i speak spanish and i learned english but i dont know it perfectly, thanks again, and bye bye.