When I plugged it in I noticed that there was no 'new hardware found' message. So I unplugged it and tried another port. I got the message this time around but Windows 7 (64-bit) failed to install the driver.
The keyboard shows up in Device Manager and its status is listed as 'driver not installed'.
I tried unstalling, then reinstalling. No success.
I tried updating the driver and setting random USB Keyboad and HID device drivers by hand. No success.
I tried unstalling and rebooting and then a really weird thing happend: the keyboard worked on the login screen and I used it to type in my password, but then Windows tried to install the driver again and killed it.
There is no USB keyboard setting in BIOS setup and the keyboard works fine both in BIOS setup and the boot menu.
I'm kinda out of ideas.
Update: I forgot to mention that Logitech does not supply drivers for this model, which is really just your run-of-the-mill USB keyboard, albeit a bit thinner than most. I also tried doing an EC reset (remove power & battery and wait 5 minutes).
Update 2: I booted up under Linux and the keyboard worked. The same goes for my other laptop running Windows