After upgrading EMP Monitor or EasyMP Monitor on my computer, no projectors appear on the screen when I launch EasyMP Monitor. What should I do?

• When a projector is registered, the settings are saved to a file called EMP Monitor.dat. When you upgrade to a newer version of EMP Monitor or EasyMP monitor, this file is replaced with a new version. You need to register the projectors again for them to appear.
  
  To avoid having to re-register the projectors, copy the EMP Monitor.dat file to another location on your hard drive before upgrading EasyMP Monitor. The file can be found in one of the following locations:
  
  Windows 2000 or Windows XP
  :\Program Files\EPSON Projector\EasyMP (or EMP) Monitor Ver.x.xx*
  
  Windows Vista or Windows 7
  :\Users\(User Name)\AppData\Local\VirtualStore\ProgramFiles\EPSON Projector\EasyMP (or EMP) Monitor Ver. x.xx*
  
  *Ver. x.xx represents the software version
  
  After upgrading EasyMP Monitor, copy the saved file back to its original location. When you open EasyMP Monitor, all the registered projectors will appear.