4GB RAM but get error msg: "Flash is out of memory"!?

I need to move a massive movieclip that contains possibly 100MB of vector drawings and animation over to another file.

It usually takes minutes to copy and then even longer to paste it into the other file.
Recently though it just crashes, or I get a message appear saying “Flash is out of memory, to increase memory, quit flash and allocate more virual memory in the system properties dialogue box.”

I have 4gb of ram, so it should be plenty.
Can someone please tell me how I can transfer large movieclips from one .fla to another .fla.