UninstallAHII.exe. UninstallAHIIIbeta.exe

[Tilt]

Where do I find these files?

[BowHTR]

AH2 should be in something like:  C:/Hitech Creations/Aces High
AH Beta should be in something like: C:/Hitech Creations/Aces High Beta

[Skuzzy]

Look in the Windows Control panel in "Programs and Features".

[Tilt]

I moved these over from another PC............. control panel can only see AHIII

[Skuzzy]

If you did not use the installer, then the uninstaller is not on the computer as that all changed when Vista was released.  And you do not have any of the start menu items.  Just remove the folders.  There is only one registry entry.

Or use the installer(s) to install over the top of the installation, then use the "Programs and Features" utility to remove them.