can't enable

hi, everyone
my window 7 laptop says that the window audio system is unable.
so I enable it. but after a later, it says that there is something unfunctionable and can't enable the window audio system.
what should I do????
pls help me.......
thx...

hello..
Can you fill your system specs, http://www.sevenforums.com/general-discussion/8-forum-rules-please-read.html
and did you already update your audio driver?