Problem opening .ppt document

I am producing a school fete programme and one company have sent me an ad in .ppt form. I do have powerpoint 2007 but when i try to open the document i get this error message,
"Powerpoint cannot read the outline from text converter is installed for this file type".
Since receiving it I have managed to view the ad (possibly on a different computer or in my mailbox) so i'm somewhat confused and as I'm hurtling towards a deadline I'd be very grateful if anybody could help! thanks!

  MAT ALAN 10:25 14 Jun 09

This error usually occurs when a file has been created in Office 2007 and saved in a format that allows older versions of Office to open them.

click here

the prog in the link should help...

Thanks that's fixed it!!

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