I went through similar dificulties when I loaded some Galil S/W.
I spent a long time with Camsoft and this is what I got, I am not sure wether it will cure your problem, but here is what I have:
You would want to first do away with the Windows Registry entries for the Galil Terminal program these are creating a conflict plus also delete any mixed-match drivers using CleanReg.exe
REGCLEAN.exe can be found in your C:\GALILOI directory
How to remove conflicting or old drivers from the Windows registry and Windows folders.
If all else fails here is how to straighten it out for sure:
1.) Uninstall Galil software
2.) Search your whole computer in all folders for these files are delete them.
2.) Run the REGCLEAN.exe program
3.) Remove the Galil card from computer
4.) Re-install Camsoft software
5.) Re-install Galil card
6.) Launch the CNC Controller
7.) If this worked stop here
8.) RegCard.exe enter choice 2
9.) GalilReg enter address
10.) Launch the CNC Controller