If you move a unit and immediately decide it was the wrong move, can you take it back and redo it?

Two minutes after I put up this message I figured it out, but thank you anyway.

I have the Matrix updated ver. 1.12, runs perfect on vista 64 bit. I recently downloded the Grand Strategy Expansion v1.02, but everytime I try to open it I get a message "windows is searching for jave.exe" and the expanion will not open.

Help please.