after installing the 7.4 Open Touch Web Service, I got the error when I tried to browse to the .ASMX file in IE:
Could not load file or assembly 'LANDesk.ManagementSuite.Database' or one of its dependencies. An attempt was made to load a program with an incorrect format.
Rather than try and figure out what the problem with the Management Suite .DLLs was, I simply deleted them from the Bin folder of the Open Touch web application and the error went away.
Retrieving data ...