Compatibility issue between MS-Office 2003 and 2007

Hello
I'm a college student and a part time writer for a small community in campus. We use a desktop with Windows 7 installed with office software Microsoft Office 2007 configured in it. Unfortunately there are no printers connected to the desktop since the old one is broken, which is Canon Bubbe Jet 400 if I'm not mistaken, and the we're waiting confirmed approval for the new one, which is HP Officejet F2600 I think.
I've created a reporting piece on the desktop using Word 2007 and tried using a computer off campus ( cyber cafe to be exact ) unfortunately they different Office version installed in the desktop.
It was Word 2003 and the result I can't open the files. I'm not exactly technology minded or updated with the latest gadget so I have no idea on how to solve this problem. I don't have extension knowledge about Microsoft Word 2007 as well only know how to open, close and type some writings in it.
I need to print out the reporting piece ASAP so I would appreciate any help to solve this problem. Can you help me ? What should I do since it's very annoying for me ?
Thanks, Laurel
