I'm having similar problems. I have a new Inspiron 530 running 32-bit Vista with a AIO 964 attached to a 3300 wireless adapter.
This setup was running fine on the old XP machine. I followed PudgyOne's advise to the letter, but no go. I also direct connected and the printer creates automatically and prints fine. Re-installing via wireless and it attempts to print, but status never changes from Sent to printer. Also, the Dell Ink management does not read the ink levels connected wirelessly, but does via USB.
Previously working notebooks running vista can no longer access printer either.
Any help you can provide is appreciated.