I got a problem to find drivers for Base System Device in Device Manager (Windows 7 Ultimate x86). After doing some googling, I found out that Base System Device is related to Card Reader (built-in). So, the solution is, find update for your Card Reader according to your laptop model.
Mine is Acer Aspire 4352. So I google the keyword 'aspire 4352', goto Acer Support/Download page, select operating system, download the card reader driver, goto Device Manager and update the drive for the Base System Device.