Nope. You can still use PowerPoint, but just have to be careful
of what you download, especially from emails. What I've heard the
latest is it is now spreading very wildly, and some tech forums
have been jammed pack full of the same questions. Antivirus vendors
are still scratching their heads for a cure as of now. If you want
to avoid it, can use OpenOffice. It's fully compatible with
Microsoft Office and best of all, it's free. 
Just change the format you save to .ppt, so that others could read
the files. 
Edit: Just for your info, use Google. Instead of opening that file,
select View as HTML. Don't need to download anything, very safe, if
you are suspicious of it. 
