Tomcat6 is refused by default by Window7.
If you wanna it launch automaticlly, you have to do like this(my system is in French).
It works for wamp too.
Right click Tomcat icon, choose “Proprities”, and then follow the schema below :
Choose tag “compatibility”, and click “Modify parameter for the other users”
In the field of “Privilege level”, check the box “Execute this program as an administrator”
And that’s OK.