file does not exist: /usr/local/apache2/htdocs/_vti_bin

Apache 2.0.48 with SSL and WebDAV enabled.

I have WebDAV folders enabled, when i tried to access through
Windows2k both in
IE as well as opening in network neigh.. i could not able to connect
and when i checked up in the apache log it says "

[error] : file does not exist : /usr/local/apache2/htdocs/_vti_bin
[error[ : optional function test said : POST
/_vti_bin/shtml.exe/_vti_rpc HTTP/1.1

I am unable to use win2k to connect, how do i solve this problem, when
i use DAVExplorer client it works fine.but i want to use only win2k
explorer to map the webdav folders.

Thanks in advance.