Ok...
I've used that brand before but not as dvd-rw. I use Verbatim. Cheap but good quality.
To format a dvd-rw. Go to the drive icon and with a disc in the drive right click. Should be in that list of functions. If it still doesn't work go on to the rest of my post. If it does then enjoy.
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Ok try this. Go to the device manager and right click on the dvd drive. A window opens with some selections. Click on scan for hardware changes. It will take a few seconds to find the drive and configure it IF any new drivers are in the system.
Now go back and see if you can drag and drop on to the dvd any files of any type. Check the disc to see if that was susessfull. If so problem solved.
If not...
Go back to the device manager and right click on the dvd drive and uninstall it. Reboot. Let the system find the drive again and install it. Try the drag and drop files again.
Try every disc in the pack you bought and if one works and the rest don't then take the pack back to the store.