How to swap Windows ID numbers for two monitors?

I have two monitors. Before a computer crash, the one on the left was identified by Windows 7 as #1, and the one on the right as #2. Now the numbers are reversed and macros that rely on screen coordinates no longer function correctly. I've tried disconnecting the right (currently #1) monitor and starting the system with only the left monitor functioning. Windows identifies the monitor as #1 as desired, but as soon as I add back the second (right) monitor Windows changes the left monitor back to #2.

Is there some way of getting Windows to call the left monitor #1?

Is the monitor that is now 2 selected as your main display?

Yes, that's correct - current #2 is selected as the main display. (It was also the main display before the crash when it was #1.)

Have you tried reversing the monitor connections?

I thought I'd tried that some time ago and it didn't work, but I tried again and -yes! - it worked. Thanks!

You're welcome.