Uninstall the driver and reinstall using the driver in the JapharFlasher topic below,

JapharFlasher : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=2012#Post2012

Also, check to be sure that your cable is not only an USB "power cable", as there is different types of cable... try more than one USB Cable connected from PC to the Service port on the back of your DM500HD.

Read also the topic for the NO CA ERROR on the DM500HD, http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=16712#Post16712

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