|OK, it is not an email issue then.|
First of all, go to Search and put in *.pps
This will find all files of that type in your system. With luck there will be more of them than the one in questions. Try double clicking any one of them to see if they all give the same error message. If it only the one file that gives trouble then there is something wrong with it.
If none of them work I'm rather back to what we went over before, except that this time we know you already have the MS PowerPoint Viewer on-board.
So, find the file fanasti_photos_2.pps file (or any other .pps file for that matter), right click it and choose Open With. If the PowerPoint viewer is an option then select that, otherwise find the path to the exe file for your PowerPoint Viewer using the Browse button. As I understand it this will be the pptview.exe file located here:
Program Files > Microsoft Office > Office12
If you can get your pps file to open, then make sure you have ticked the box to always use this to open pps files, otherwise next time it will fail again.
If none of this works then you could go to Control Panel > Programs and Features and uninstall MS Power Point Viewer. Now use the link in #5 to download a fresh copy and install it again. You "might" still have to set up the associations as above but a new copy of the viewer could cure the issue.
Always pop back and let us know the outcome - thanks