Changing Win7 taskbar position messes up screen?

[Gurachn]

Hi Don,
Thanks for the reply, but unless there has been a change, the big "PLEASE READ THIS NOTE !" only warns to run from either the top or bottom,(which I had) and not the side.
It says nothing that you once you choose which, you are stuck with that position for life!

I'm guessing that it saves the location somewhere after the first running? Where might that be, and is it not possible to remove that information and start fresh?

Also might the fact that I am using a dual monitor setup with extended desktop be having an impact?
It had run flawlessly up till now, but now seems to be holding a grudge