Failed to load launcher dll, need help ASAP

[=WWIII=]

Any ideas why this doesn't work, I get the same problem with steam.dll not loaded, and launcher.dll...

"D:\Valve\Steam\SteamApps\xxxx\source dedicated server\srcds.exe" -game hl2mp -console -tickrate 66 +fps_max 600 +maxplayers 8 -port 27015 +map dm_lockdown +exec server.cfg