If you can not access to the web page, you must check than Jenkins service is running.
Open a Command Prompt and go to C:\Program Files (x86)\Jenkins
Here you can type:
Net stop Jenkins
Net start Jenkins
To avoid problem I've manually removed the project under C:\Program Files (x86)\Jenkins folder and performed from menu: Jenkins + Manage Jenkins + Reload configuration from disk
By this way I've a clean installation.
Now I've created a new item where I defined the project and added the dir command to be sure Jenkins is using the right path. I copied and extracted the zip file (Jenkins_command_line.zip) in the workspace created.
Check the .bat file is correctly configured for your PC installation (CodeWarrior Folder).
If you execute the bat file, it should work fine outside Jenkins too.
If it's not the case you must review the .bat file.
After that I added a new build step for my_test.bat.
Now when I clicked on Build Now, the my_test.bat is executed.
Attached a video showing the process, this doc in word doc, and the example I'm using