New USB-driver are here:

http://www.calyx.kr/xe/notice/33019

Please refer to how to instruction as following

http://www.calyx.kr/xe/faq/32883 <-  English Manual

If you are using old version (ver2.19.0) 

Control Pad ->  Program ---> ‘USB Audio 2.0 Stereo Driver v2.19.0’, select and Unistall

Then install the newest version(ver 2.23.0)

Supported Operating Systems
  - Windows XP with SP3 (32 bit)
  - Windows Vista with SP2 (32 bit)
  - Windows Vista x64 with SP2 (64 bit)
  - Windows 7 (32 bit)
  - Windows 7 x64 (64 bit)
  - Windows 8 (32 bit)
  - Windows 8 x64 (64 bit)

  - Windows 8.1 (32 bit)
  - Windows 8.1 x64 (64 bit)
 
  Minimum Hardware Requirements
  - Intel Core 2 @1.6 GHz, or AMD equivalent
  - 1 GB main memory