A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
It sounds like you may have copied some PowerPoint files to your new computer, but not the ones that contain macros.
A macro-enabled presentation has a .pptm file ending, while a macro-enabled template has a .potm file ending. However, it's possible to create a .pptm or .potm file that doesn't actually contains macros.
If the Developer tab is not already visible, please choose File>Options>Customize Ribbon, check Developer in the right-hand list and OK out.
While the file is open, please choose Developer>Visual Basic. The VBA editor opens. Is there text visible, or is the window blank. If it's blank, your file has no macros in it.