To remove a wrong driver in windows

Was unable to connect a neighbor's Nook Color as a mass storage drive to a windows computer. Turned out the ClockworkMod universal ADB drivers installed earlier have a priority and won't let the usbstor.sys (the mass storage) to be selected a the primary device driver. Uninstalling the driver for the device in the Device Manager did not help, it appeared again after the device was unpluged and then plugged again.
Knowing the vendor and product IDs (for the Nook Color they are VID_2080&PID_0002), I found the ClockWork's oem##.inf file in the %SystemRoot%\inf folder.
Where ## is a number of the .inf file where the device VID and PID were mentioned.
Tried to delete that oem##.inf and then reboot the PC, did not help.
But what did help, is Window's pnputil utility.
Execute the following command as administrator and then even no need to reboot:
pnputil -d oem##.inf

Also, there is an useful utility to maintain the currently and previously connected USB devices.

USB drive instead of Floppy.

Some things beyound my understanding. Here is a story. After a windows update on our DELL server, windows 2003 refused to boot, even in the safe mode. We decided to run the recovery from the installation DVD. But the problem instantly occured - the installer did not recognize the DELL's PERC/5i RAID controller. The machine did not have a floppy drive (even though the motherboard actually has a floppy connector on it). We contacted the DELL tech support and were told to put the PERC driver to a USB flash drive using special utility available also to download (the content of the drive was gone, so saddly to say). Then, standard F6 key worked and the installer saw the driver on the USB drive as it was a floppy disk.
How it did that? No clue.