That isn't at all normal. I've found Win7 to be very reliable and have had no problems at all with hardware. In fact, I've installed 7 on some old laptops which required half the drivers to be installed manually on Vista, and 7 picked up and installed pretty much all of the hardware.
Some wireless adapters just don't work properly with 64-bit Windows, though, because their drivers aren't very good. Have you checked that the dongles definitely have 64-bit support?
Some wireless adapters just don't work properly with 64-bit Windows, though, because their drivers aren't very good. Have you checked that the dongles definitely have 64-bit support?