i tried to register netshell.dll failed in windows xp

I cannot open my localconnection's properties, so I tried to register the netshell.dll file, but got a dllregisterserver failed, return code is 0x80020009 error. When I used regsvr32 netshell.dll /u, it worked. After that, I use regsvr32 netshell.dll again, got that dllregisterserver failed, return code is 0x80020009 error again, somebody help!