You should try providing the direct path to your Tekkit.jar.
Right click on Tekkit.jar -> properties
copy the text beside "Location:"
paste it in front of Tekkit.jar in your Launch.bat and then add "\" between your paste and the "Tekkit.jar" and then add quotes around the path
and example would be:
"C:\Program Files (x86)\Java\jre7\bin\java" -jar -Xmx1G -XmX1G "C:\Users\Jordan\Desktop\Tekkit server\Tekkit.jar" nogui