Hello!
Don't worry! It's standard procedure!
Next step would be to connect the UFX II, so windows can detect it.
After detection and a reboot, you will see two icons on the right of your windows taskbar. One will be for the driver settings and the other for TotalMixFX.
Here's a quote of the manual regarding Driver Installation:
6.1 Hardware and Driver Installation
To simplify installation it is recommended to first install the drivers before the unit is connected to the computer.
But it will also work the other way round.
Insert the RME Driver CD into your CD-ROM drive. The driver installer is located in the directory \MADIface_USB (NOT Fireface_USB)
Start rmeinstaller.exe and follow the instructions of the installer.
After installation connect computer and UFX II using a USB 2 cable. Windows detects the new hardware as Fireface UFX II and installs the drivers automatically.
After a reboot, the icons of TotalMix FX and Settings dialog appear in the notification area.
Driver Updates do not require to remove the existing drivers. Simply install the new driver over the existing one.
Also, here's a link for the UFX II manual:
http://www.rme-audio.de/downloads/fface_ufx2_e.pdf
RME Gear: Digiface USB, HDSP 9632