Malware is the single most common problem faced today by computer users and IT support technicians. Whether it's a virus, worm, Trojan horse, rogue security program, rootkit, or whatever type of malicious software, these infections can be very difficult to find and remove.
Making the issue more complex is the wide variety of symptoms that may be exhibited by the malware. Some will pop up annoying messages; others will interfere with your connection to the Internet. Many will affect the performance of the computer, slowing it to a crawl.