To register VCE Express IMAQ Adaptor driver, open Matlab and run following command :
  imaqregister('<vce_express_installation_folder>\Drivers\Matlab\<platform>\vceexpressimaq.dll');
For example:
  imaqregister('c:\Program Files\Imperx\VCE Express\Drivers\Matlab\Win32\vceexpressimaq.dll');
or 
  imaqregister('c:\Program Files\Imperx\VCE Express\Drivers\Matlab\x64\vceexpressimaq.dll');
