Power Point portability?

I have a new laptop, that has a 2 month trial version of MicroSoft Office on it, including the Power Point program. PowerPoint is the only item on the whole package I would ever use, so after the 2 month trial, I won't be paying the over $100.00 to continue using it. Once the trial version is over, will I still be able to use the PowerPoint presentations I have made ? If I move them to another computer by flashdrive, will they still function in presentation mode if I want to use the ones I made for business meetings, or do I need the PP program to use the presentations I made during the trial ?