I’ve been running into a lot of computers with varying degrees of Malware (term for anything malicious such as viruses, worms, trojan horses, spyware, adware, most rootkits, and other malicious programs). It manifests in all kinds of ways from bogus disk drive definitions, hidden program groups and files, printers not working to general crashing.
I strongly suggest that you all install Malwarebytes and run it. Here’s a link to the Free version. Just make sure you don’t select the Trial or Pay version. http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?tag=mncol;1
Also, if you want a great free Anti-Virus. Avira, avast! and Microsoft Security Essentials are pretty darn good.
Happy & Safe computing!
Joe