Download and install jsmd5m_setp.exe
http://hosted.filefront.com/bigboywooly/2341861
Download GWX md5 from same place and place in folder along with GWX exe and bin files
Run the MD5mate program
Click the middle tab - Compare from MD5 file
Then click on the - 1 select MD5 file
Point this to your folder with the GWX files and GWX md 5 in
The program will then run and check all 8 GWX files for corruption