Serious problems with Practice Files

I have Power Point 2010 and trying to download practice files from the Step by Step for Power Point 2007. Each time try to extract practice files I would get an error that says a problem occurred do you want to repair, and I would say yes. But, I've notice since then while I am working in power point a message constantly coming up saying the program has stopped working, would you like to close or restart the program. This has happen every time I try to work on a practice file and now just working in Power Point period. So now I am afraid that a virus has gotten on my computer with this CD. I in school at Antonelli College in MS. My name is Bernice Harris
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