1) You said Tomcat ‘is installed in’ D:\Tools\Apache\jakarta-tomcat-5.0.19 (which I take to mean it is currently installed there) but you mentioned that your Tomcat 5 dir is set to D:\Tomcat5 (which I got from your post that was a temporary testing location). Just double check that these two locations match up, I might have just read too much into your post.
2) Change your web context to /emco, as this will be deployed to your Tomcat\webapps dir, and I don’t believe deploying using multiple levels like you have will work… but I could be wrong.