I have windows 7 64 bit, and SDL manager works without any issues, so your problem is not to do with windows 7 specifically.
make sure that you have run this executable on your windows 7 machine:
http://www.motec.com.au/filedownload.ph ... docid=3576Also, ensure that you have the same version on both laptops.
Finally, I recommend tha tyou try to open the config by starting up dash manager, and using the File/Open option in the software rathern than double clicking on the config.
regards,
Jamie