When you're installing multiple versions fo Office apps, the oldest ones should always be installed first. You may be able to restore the Powerpoint 2010 installation by reinstalling it.

That said, there is generally no need to have both versions installed, as Powerpoint 2010 can open, edit and save files in the earlier format. For vba, you can develop your code using early binding, then switch to late binding before saving for use with older versions.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]