Free security software can put a stop to most obvious virus attacks. Of course, that won't stop cybercriminals from trying sneakier ways to invade your system.
The latest sneaky virus to watch out for is an oldie, but it's definitely not a goodie. It targets Microsoft Word and Excel.
Word and Excel both have a system that lets users create "macros." These are little programs that make it easier to do complex or repetitive tasks.
Well, macros also let hackers create viruses that run when you open the wrong Word or Excel file.
Because this used to be such a big threat, Microsoft disabled macros in both Word and Excel by default. In fact, if you open a document with a macro, you'll get a security warning.