If your machine hasn't been updated in a while with the latest Microsoft updates, and virus definitions ... this may be a good time for you to take some time to do so. Every week, hundreds of new viruses are being created and causing PC's everywhere to buckle, particularly when it comes to Microsoft products.
The latest virus getting a lot of press is called the "Zero-day Microsoft PowerPoint" trojan virus. After you've updated your machine(s), check out these links to get more information about it:
http://tailrank.com/posts/562949953823303/Microsoft_PowerPoint_0-day_Vulnerability_FAQ
http://www.technewsworld.com/story/37089.html
Hey, be careful out there!