In all cases, malware, spyware, and viruses are a result of some action taken by the user (you or a family member that uses your computer). Remember, cyber criminals are incredibly clever and gain access to your computer via some of the most innocent and common activities you are performing; that is why it SEEMS as though it is your computer's fault.
For example, many of the clients we see simply downloaded an emoticon software program. Emoticons are the smiley faces and action characters that you see at the bottom of many people's e-mails. In doing so they also (unknowingly) downloaded a payload of spyware and malware and before they knew it, could no longer use their computer due to the instability and pop-ups.
Other deadly programs to avoid are free "enhanced" web browsers, screen savers, and just about any "cute" programs you come across that are free to download. Always read the terms and conditions before downloading ANY program to look for clauses that allow them (the software vendor) to install spyware programs on your computer.
Installing programs is not the only way a hacker or malware program can access your computer. If you do not have the most up-to-date security patches and virus definitions installed on your computer, hackers can access your PC through a banner ad on the web that you accidentally clicked on or through an e-mail attachment that you opened.
Just recently, hackers have even been able to figure out ways to install malicious programs on your computer via your Internet Explorer web browser EVEN IF YOU DIDN'T CLICK ON ANYTHING OR DOWLOAD A PROGRAM. Microsoft is constantly providing patches to their operating system software and all it takes is one missed update to leave you completely vulnerable.
Finally, you should COMPLETELY AVOID any and all peer to peer file sharing networks such as KaZaa. These sites are the absolute WORST online activities you can participate in for your computer's health because they are pure breeding grounds for hackers, spyware, malware, and other malicious attacks.