I have searched for this, and sorry if I missed it elsewhere on here.
My hard drive crashed, so I got a new physical drive and instead of Vista I installed Windows 7 Ultimate - not a restore from backup type of recovery. I reinstalled iTunes and I copied over, from a recent NAS backup, my former iTunes directory..
When I go into iTunes it says that I have another computer activated (the broken hard drive) and that I have 3 activations left. Not a huge deal since I am usually active on one or two machines anyway BUT, how I can deactivate an iTunes account on a broken hard drive? Did I miss something in the copy of the old iTunes folders from the most recent backup? A registry setting? A hidden something?