Upgrading from Peachtree 2003 to 2007 issue..

I am upgrading my company's software from version 2003 to 2007... the upgrade appears to all go smoothly, but following the data conversion, Peachtree will not open the company's data... however it continues to work
fine within the 2003 version. Has anyone else seen this? Any ideas?
Thanks... please email me directly at snipped-for-privacy@comcast.net
thanks!
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