Silent and invisible, some malware sneaks up on you to quietly wreak havoc on your system resources and possibly mine your files for personal, bank account-cracking information. Shudder.
Other types of Trojans more helpfully announce their presence by lobbing pop-ups, disabling your Start menu, or in Matthew's case, playing puppet master with your browser.
Matthew has a few ideas for wresting back control. Find out which he tried, which he should he have tried, and which ultimately worked in this week's Spyware Horror Story, "Browsers behaving badly".