video software

so i have to make a video for my graduation project. it has to be able to include text, audio, and video. i want it to look really good

does anyone know of any good programs i can use that aren't going to cost me that i can download free online or something? i really dont want to download anything on this computer that costs me just for this one project and im going to turn this computer in at the end of the year so i would just lose it and it would be pointless.