When I use 2 monitors, one on VGA and one on hdmi, Win 7 will always assign the hdmi monitor as 1 and the VGA monitor as 2. How can I manually assign these?
There is no GUI way that I've found.
and more specifically
are where Windows stores the mapping of the displays. It keeps track of monitors it's seen based on date and when if finds a monitor it's seen before it assigns a number. You can delete these two keys in the registry then reboot and the video card/windows will assign numbers to the displays using its default logic.
You can manually edit the registry keys and values, reboot and the system would keep the manually defined IDs however this is a rather painful experience and should be avoided without backups.
Apologies for bringing this thread out of the dead, I thought the information was worth sharing since I had the same question.
I have read this software allows you to change that.
Depending on the Video driver you have whether you can change it in Video properties.
Does the actual number that's assigned matter, or do you just want to make your VGA monitor the primary monitor (the one that shows the taskbar)?
If all you want to do is change the primary monitor, right-click on your desktop, select 'Screen Resolution', click on your VGA monitor on the diagram (monitor number 2 in your case) and then click the checkbox 'Make this my main display'.
Some programs are affected, such as PowerPoint, when we want the complete (final) image on the projector screen, it shows up on our desk monitor instead and shows the work area being projected along with the images.
If this is not your issue, then I'm really interested why the actual order of the monitors matters to you.
In Windows 7, if you right click on your desktop, you can go to personalize and appearance and personalization. From there, you can go to display and screen resolution. In this window you can assign the monitor numbers.
You can find more info here: http://windows.microsoft.com/en-US/windows7/Move-windows-between-multiple-monitors