One of the common email problems folks have is opening PowerPoint (or .pps and .ppt) attachments. There's a lot of cool stuff in PowerPoint format which is often forwarded to others via email, but if you don't have PowerPoint on your computer, you can't open the attachments.
Luckily, Microsoft provides an easy fix for this problem. You can download and install a free PowerPoint Viewer from the Microsoft website. This viewer will allow to view and print PowerPoint presentations, but not create or edit them. For most folks, this is fine.
You can get the PowerPoint viewer by clicking here, or by searching "PowerPoint viewer" in Google.
It's also worth noting that Microsoft also provides free viewers for Word and Excel which you can download and install. Again, these viewers allow you to open, view and print Word and Excel documents (but not create or edit them).
You can get the Word Viewer by clicking here.
You can get the Excel Viewer by clicking here.
Keep in mind that if you already have Microsoft Word, Excel or PowerPoint installed on your computer, then you don't need to download and install the viewers.
Some new computers come with the PowerPoint viewer already installed, so it's a good idea to check your programs list before downloading and installing it.