WordPress MU

This is error information:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, cycle_zb@qq.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
Apache/2.2.4 (Win32) PHP/5.2.3 Server at 127.0.0.1 Port 80

The Mysql show the wpmu datebase have created.
When I click the login,the error information come out.
I have read the Readme.
When I restart the apache after I changed the httpd.comf according to the Readme,it does't work.So I changed it as it before. The apache workd,but the wpmu isn't working.It can't login,and show the error information.
Hope someone can help me.Thanks!

Sounds like an htaccess file problem. Did the install create an .htaccess file?

Yes,there is a .htaccess file.
How should I do?

your apache error logs will usually give you some idea about what is causing the 500 error.