Unable to Install TomCat!!

I am following these steps now:

http://code.google.com/webtoolkit/doc/trunk/DevGuideServerCommunication.html#DevGuideRemoteProcedureCalls

---- Simple Example with Apache Tomcat

My concern is i have downloaded apache-tomcat-6.0.29 and apache-
tomcat-7.0.5. I am trying to install tomcat, whenever i double click
on the .exe files from the bin folder:

tomcat7.exe and catalina.bat -- Dos prompt comes up and goes away
like aflicker, nothing happens

tomcat7w.exe -- Error thrown "The specified service does not exist as
an installed service.

unable to open the
service 'tomcat6'.

Can anyone suggest me what to do. I am stuck and not able to proceed
further.

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.