Opening documents from a different computer onto another one

Hello, I study graphic design so I've installed the adobe programs on my computer. When I work on the school computers (wich also have the same programs such as InDesign and Illustrator) I save them on the computer as well as on a USB key. My problem is that when I try to open the work I've saved on my key onto my laptop, it won't open... I've tried updating my programs and using a USB that has more storage. It still won't open any of my documents..