"preparing to copy to applications" stuck

Question

Long story short: I accidentally dropped a second copy of Microsoft Office into my Applications folder. I didn't mean to do that, so when the COPY window appeared saying that it was preparing to copy, I clicked the x to stop.
The status changed to "stopping" but the COPY window will not go away. I can minimize it but not close it out. I cannot shut down or log out--only a hard shutdown. How do I make this go away?
This was 24+ hours ago.
Here's a picture of the window--the animation is still cycling on the progress bar.

Answer 1

Hi Liz, this is what works for me every time the process runs ongoing. Bear with me.
For those who are confident with Terminal
Warning: Make sure you type in the following commands exactly as shown, case sensitive and proper spacing, please.
In Menu bar at top of screen, upper right hand corner, click on the magnifying glass icon which is “Spotlight.”
Type in “Terminal.” Click on “Top Hit Terminal”. This opens the Terminal utility.
At the prompt type:
ps aux
This command lists the currently running processes on your computer.
Not to confuse the main intent of this discussion, only going over what needs to be typed to cancel the running process. With that said.
The 1st column: USER, is where the process is running under.
The 2nd column: PID, is the process ID.
The 9th column: STARTED, lists the date and time the process started.
The 10th column: TIME, lists the total time the process has been running.
This command filters out the running process that you are concerned with by name.
In Terminal type at the prompt, but do not press “Return/Enter” yet:
     ps –ef | grep –w name
Replace “name” in the command line above with the corresponding number listed under “PID,” that is located to the right of the “USER,” from the table that was created in Terminal “ps aux” of the process you want. Remember this number and jot it down. Only after number is replaced, press “Return/Enter.”
Now for the good stuff, stopping the process that doesn’t end.
In Terminal type at the prompt, but do not press “Return/Enter” yet:
     kill -9 pid
Replace “pid” in the command line above with the same number you replaced for “name” in the command line:
“ps –ef | grep –w name” that you jotted down. 
If the command above does not run under your “user” account, you will have to insert “sudo” before the above command and run the command as an administrator.
In Terminal type at the prompt, but do not press “Return/Enter” yet:
     sudo kill -9 pid
Remember to replace “pid” in the command line above with the same number you replaced it for the 1st time you ran “kill -9 pid” before inserting “sudo” in command line.
After running “sudo kill -9 pid” command you will be asked to enter your password.
When this command is run the running process will be “killed.” The running process will not be seen on Desktop or appear in Terminal command “ps aux” or “ps –ef | grep –w name” anymore.
The dreaded endless, “Stopping…, Preparing to copy” the ongoing process will be over.