I cannot enter the file in the server

I used to access the web file in the server with https://......
When I change and use Vista, I cannot enter it.
It pompt "Internet cannot use the format of web file to open
https://website... Would you use the default mode to open it?"
When I press N, nothing happen and I cannot enter it.
When I press Y, I pompt me to enter my password and then It go to a page of
this
_________________________________________________________

Forbidden
You don't have permission to access /~xxxxxxxx/ on this server.


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Apache/2.0.50 (Unix) mod_ssl/2.0.50 OpenSSL/0.9.7a DAV/2 Server at
xxxxx.xxxxx.xxx.xx Port 443