Trouble using a macro in excel that involves Powerpoint

I use Windows XP Professional, Service Pack 3, Office 2003.

I must copy&paste thousands of times some charts from excel to ppt and i wanted to use a macro using VBA.

I found in internet some scripts that creates slides and objects in powerpoint from excel, so i tried to use them to understend how to handle powerpoint objects from a script in excel.

I've found this kind of script:

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Before using this macro, I checked the Tools --> References --> Microsoft Powerpoint 11.0 Object Library.

Anyway, when I try to use this script, I get a run time error. It says that the library is not registered.

In my Italian version of office is:
"Errore di run-time '-2147319779 (8002801d)':
Errore di automazione
Libreria non registrata."

The line of code where it appears is:

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I think VBA cannot use the PPT OLB library, but I don't know why. MSPPT.OLB is in my Microsoft Office/Office11 directory.

Thank you very much