I suggest you install PowerPoint Viewer, even if you have MS Office PPoint installed, it loads much faster. Then, go in Folder Options-File Types and change the program associated with pps & ppt extentions to PPViewer. As for viruses, your AV program should have an Office plugin, to automatically scan all Office files on opening (NOD32 does), so you should be ok. This is my setup, and I never had a problem in 8 years!