This should be able to be done by setting the "Path" when your computer starts up. So you're using Win 7... Just wondering why you're using the command line to launch these?? There are much easier and quicker ways....
The path is now managed by Windows 7 and not the autoexec.bat or autoexec.nt files. To change the system environment variables, follow the below steps.
1.From the desktop, right-click My Computer and click Properties.
2.In the System Properties window, click on the Advanced tab.
3.In the Advanced section, click the Environment Variables button.
4.Finally, in the Environment Variables window, highlight the Path variable in the Systems Variable section and click the Edit button. Add or modify the path lines with the paths you wish the computer to access. Each different directory is separated with a semicolon.
Hope this helps