[codedr]

We had a similar issue.
When setting ip-addresses on the ethernet port, sometimes windows 'remembers' the old
addresses and it confuses the FIRST cRIO imaging tool, but MAX tool work fine.

Open a command window
type 'ipconfig'
If the output shows multiple ip-addresses for your ethernet port, you can delete them
with netsh.
type 'netsh'
type help and it will show you the syntax to delete the extra addresses.