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I don't know if this will help you or not but you could give it a try.
After building my 420, I followed the "Getting Started" manual and installed WinPC-NC Starter software as the machine comes pre-installed with the USB module.
The PC and machine failed to connect so I had a look in the WinPC-NC Starter installed folder and found CDM setup file and ran that, this installed the drivers and it worked for me.
Then we took out the USB card that comes with the 420 machine and put the UC100 in and everything worked mach3.
My version of Mach3 came from StoneyCNC with a STEPCRAFT420 profile.
Blan and Good luck
tikka schrieb: I had a strange problem when I tried to install Mach3 on my CNC computer. Got an old used PC with a clean 32 bit xp installation for running the Mach3. It isn`t connected to the internet and doesn`t have any antivirus/firewall turned on. An USB memory stick seemed like a good way to transfer the Mach3 installation file, but had two errors when I tried to copy or run the file from the stick. The errors were something like this: "Can not copy file because it is corrupted or unreadable" and "... is not a valid Win32 file". The solution was simple, I used another USB memory stick I have that is nade by a different manufacturer. No more problems.
Just in case someone else has a similar trouble.