Thanks for the responses. I tried updating the driver, as suggested, to V.1.1, but Windows 7 tells me that V1.0 is the latest driver. The Rosewill website offers the following additional downloads, but I don't know whether any of them would be helpful (would running one or all of them maybe allow me to install the V.1.1 driver?):
RC-216 BIOS Flashing Utility V1.1
RC-216 Firmware ver 1.06.70
Trouble shooting - BIOS flashing V1.0
I'm not a total rookie, but I'm hesitating to make BIOS or firmware changes (I'm not even sure how to go about using these downloads, because they come without instructions or read.me files). Any suggestions of how to proceed would be greatly appreciated.