403.14 error and 404 errors

1. this is for 403.14
2. Start IIS Manager. To do this, click Start, click Run, type inetmgr.exe, and then click OK.
3. In IIS Manager, expand server name, expand Web sites, and then click the Web site that you want to modify.
4. In Features view, double-click Directory Browsing.
5. In the Actions pane, click Enable.
6. check the link for this
7. http://support.microsoft.com/kb/942062/

for 404 errors:
http://www.getnetgoing.com/HTTP-404.html
http://www.getnetgoing.com/HTTP-404.html