Malware sucks. In the best-case scenario, it craps up your system with unwanted files and occasionally makes itself known in the form of a persistent pop-up window or annoying browser-based toolbar. In the worst-case scenario, malware completely takes over your desktop or laptop and ruins your life.
Your system slows it to a crawl. You can’t even boot into Windows in the time it takes you to walk to the kitchen and back. Your data gets sent off to a faraway Internet land or, worse, your actual keystrokes are recorded for some unsavory individual to see. Malware locks down you browser, making you unable to actually do any browsing without being carted off to some bogus domain. You can barely run a program in Windows without getting bombarded by fake advertisements, programs, and dancing people on your desktop.
We can’t make this stuff up…