[KWo]

Do You have any file in ..\cstrike called autoexec.cfg ? If so - post also its contents here.
Show us also Your CS launch options (fire-up Steam, Click "Play games", then right button mouse click on "Counter-Strike" and then - at the window You will see - in the middle of it - there is a button "Launch option" - click it and show us the contents of it.
Make sure in the liblis.gam now You have the call for metamod like this

gamedll "addons\metamod\dlls\metamod.dll"
and without gamedll "dlls\mp.dll"
and You really have the file metamod.dll in ...cstrike\addons\metamod\dlls directory.