I initially attempted to post this message in the discussion forum but for some reason my first message was not recorded.
This message is my second attempt to post this same message. I apologize if this message turns up again on your website (duplicated query) but my first attempt to post this message was not recorded in the discussion forum in a timely manner (messages are usually instantly updated in the post forums and I don't know why this post did not update immediately).
Anyway, this is the problem:
I downloaded and installed an Agilent VNA Uncertainty Calculator program on two separate computers. This is the webpage address of the program:
Did you copy he VNAUncert.dll into the Windows system32 (32-bit system) or SysWow64 (64-bit system) directory? That is where that error usually comes from. During the install, I set C:/Windows/system32 and it dropped it in the right directory.