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You are not giving enough information other than you are using DVD Movie Factory and i assume the full version not the one provided with X3.
It would help if we knew what type of capture device you are using, I assume Firewire IEEE.
Some connections can only be accessed by one program at a time, so if you have another video capture program running that may be taking control of the port.
I know if i run Win DV, then try to capture with Corel software i get the same error and visa versa.