Windows Server 2008: Sometimes Windows shows the simple file sharing dialog while other times …

when I try to share a folder to my LAN on Windows Server 2008 Standard, sometimes Windows shows the simple file sharing dialog while other times it shows the advanced dialog. I have no idea why this happens, I want Windows to show the Simple file sharing dialog always. Can anyone help?

Windows 2008 VPS via Windows Server 2008: Sometimes Windows shows the simple file sharing dialog while other times ….