Hi Encio,
This is the answer given by Shawn Toh some time ago to a similar question,
see if it helps for you:
"Go to My Computer > C: > Program files > Microsoft Office > Office 11.
Look for POWERPNT.exe.
Right click on POWERPNT.exe and select properties.
Select the Compatibility tab.
Put a checkmark on "Disable desktop composition".
Click Ok.
Now, open PowerPoint.
You should get a message saying the color scheme has changed to Windows
Vista Basic and some visual elements are disabled temporary.
Try and see if it works this time round. "
Worth a try.

Signature
Luc Sanders
MVP - PowerPoint
> Hello everybody,
> i am using office 2003 on Windows Vista on my new notebook.
[quoted text clipped - 11 lines]
>
> thanks a lot
Encio - 03 Oct 2007 12:32 GMT
wooooot thanks a bunch mate, I was going really crazy with this!!!!
you cannot imagine :)
thanks again
> Hi Encio,
> This is the answer given by Shawn Toh some time ago to a similar question,
[quoted text clipped - 26 lines]
> >
> > thanks a lot
Luc - 03 Oct 2007 12:51 GMT
Encio,
Don't thank me thank Shawn, I just remembered he posted that a while ago.

Signature
Luc Sanders
MVP - PowerPoint
> wooooot thanks a bunch mate, I was going really crazy with this!!!!
>
[quoted text clipped - 34 lines]
>> >
>> > thanks a lot
Steve Rindsberg - 03 Oct 2007 16:27 GMT
Shawn suggested this as a FAQ article a while back too:
Shapes move when I click them (VISTA)
http://www.pptfaq.com/FAQ00882.htm
> Hi Encio,
> This is the answer given by Shawn Toh some time ago to a similar question,
[quoted text clipped - 10 lines]
> Try and see if it works this time round. "
> Worth a try.
-----------------------------------------
Steve Rindsberg, PPT MVP
PPT FAQ: www.pptfaq.com
PPTools: www.pptools.com
================================================
Luc - 03 Oct 2007 17:13 GMT
Steve,
I should have known you had an entry on it. (Bashing on the head)

Signature
Luc Sanders
MVP - PowerPoint
>
> Shawn suggested this as a FAQ article a while back too:
[quoted text clipped - 22 lines]
> PPTools: www.pptools.com
> ================================================