Step 2: Run or Install Script
If you can get access to their computer for even a few seconds, you can run the script once and then it will never happen again (Unless you change up the timing in the code). The script will not run any windows, or anything in the task bar, the only item you can see is an entry in the Process Manager as 'wscript.exe'.
The ideal situation would be if you had a bit more time than someone getting up to go to the photocopier:
1) On most computers there is an icon for 'My Computer' on the desktop, Right Click and go to Explore.
2) If you navigate to C:\Documents and Settings\All Users\Start Menu\Programs\Startup then put the script in that folder, every time the computer is loaded into windows the script will run.