remove xcompmgr from startupHook.

diff --git a/xmonad.hs b/xmonad.hs
index 19e005a..c7cdb0c 100644
--- a/xmonad.hs
+++ b/xmonad.hs
@@ -43,7 +43,6 @@ main =  do
         mouseBindings      = myMouseBindings,

       -- hooks, layouts
-        startupHook        = spawn "xcompmgr",
         layoutHook         = myLayout,
         handleEventHook    = unmapEventHook <+> minimizeEventHook,
         manageHook         = baseManageHook <+> myManageHook,