MsgBox, % IsAhkInstalled()

IsAhkInstalled()
{
	if A_Is64bitOS
	{
		Loop, HKLM, SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall, 1, 1
		{
			if (A_LoopRegName = "DisplayName")
			{
				RegRead, var
				if RegExMatch(var, "i)^autohotkey")
					Return A_LoopRegKey "\" A_LoopRegSubkey
			}
		}
	}
	
	Loop, HKLM, SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall, 1, 1
	{
		if (A_LoopRegName = "DisplayName")
		{
			RegRead, var
			if RegExMatch(var, "i)^autohotkey")
				Return A_LoopRegKey "\" A_LoopRegSubkey
		}
	}
}