example error after successfully installed web as 6.40

Hi, I am trying to install web as 6.4 Java on win2k3. Central Instance on one server, Oracle DB on second server. I went through the 3-step distributed installation process successfully. But when I typed in http://localhost:50000, I got error of Java can not unzip com.sap.engine.docs.examples.

I went to visual administrator, I saw a bunch of red crosses under services->deploy->servlet_jsp.

What went wrong? Is it possible that I re-deploy some of the applications like examples separately without re-installation?

Any suggestion is highly appreciated. Thanks.