Power Point Cannot open in 2010

Have a ppt powerpoint that was created in 2010.
User grabbed an older powerpoint created in 2003 most likely to use the master slides or something. So they added about 70slides and saved it all the time in 2010.

when you try to open it with 2010 = says corrupt, tries to repair and failes.

I just reinstalled 2003 and it open without issue. Any ideas to get this fixed?
Would really appreciate it.