How to convert an Office 2007 powerpoint file to be viewed on powerpoint 2003?

I have a new computer with Office 2007 on it... I have done a powerpoint presentation for work, have saved it on my USB, and I cannot read the file at work as work uses powerpoint viewer 2003 (i think). I cannot download the 2007 version as it is the NHs and they won't allow it!!
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