I'm not sure if you ever found the solution but I was having the same issue. After installing Windows 7 on a Sony Vaio, I ended up with a "System Base Device" and an "Unknown Device" listed in the Device Drivers. In my case it was the following:
System Base Device - The Card Reader driver for Win 7.
Unknown Device - Firmware Extension Parser (under System Components) for Win 7.
Both available at the Sony website.
Hope this helps you or anyone who is having the same issue.