@ FightingBob
For PT2007, Inno Setup puts this key (and associated names & data) in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\jv16 PowerTools_is1
For PT2008, the key is:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\jv16 PowerTools 2008_is1
Simply removing the PT2007 key (with regedit or Registry Finder or whatever) will make PT2007 drop from the Add/Remove programs applet. This way, your current situation with the PT2008 data, settings and so forth remains intact and you don't have uninstall/reinstall anything ...
Whatever shortcuts you have for PT2007 and PT2008 from the two installs (for example in the Start Menu, Quick Launch, etc.), actually point to PT2008 stuff (based on your post), so you can either delete the PT2007 shortcuts manually, or use them, or ignore them.