Let's forget about REW for a bit and see if the card is installed correctly.
When you examine the Playback and the Recording Devices (by right clicking the speaker in the System Tray of Windows), do you see the SRM soundcard shown as seen in the pics below?
You should see both the laptops on-board soundcard and the SRM soundcard listed in both.
Playback devices shows SRM analog and digital outputs plus the onboard device 
Recording devices shows the SRM two analog and one digital inputs plus onboard device 
brucek