Check for a program group called "Windows NT Option Pack". In that group will be a subgroup for Internet Information Server. You will have "Internet Service Manager listed in there" Run the application, not the HTML version.
Once in there follow the directions below:
Creating Virtual Directories
If your Web site contains files that are located on a different drive than the home directory, or on different computers than the computer running Internet Information Server, you must create virtual directories to include those files in your Web site. A directory can be located on a local drive or on another computer on the network. To use a directory on another computer, you must specify the directory’s Universal Naming Convention (UNC) name and provide a user name and password to use for access permission. For an overview of virtual directories, see Virtual Directories.
To create a virtual directory
In Internet Service Manager, select the Web site or FTP site to which you want to add a directory.
Click the Action button, and then point to New, and select Virtual Directory.
Use the New Virtual Directory wizard to complete this task.
To delete a virtual directory
In Internet Service Manager, select the virtual directory you want to delete.
Click the Action button, and select Delete. Deleting a virtual directory does not delete the corresponding physical directory or files.