EarthLink finds spyware running amok

The Internet service provider worked with security company Webroot's software to scan consumer PCs, surveying more than 3 million systems between January and September. The study found 83 million instances of spyware, a sign of increasing bombardment by malicious software.

Spyware programs hide in PCs and secretly monitor user activity. Typically, spyware arrives bundled with freeware or shareware, or through e-mail or instant messages. The programs are difficult to remove and may cause computers to run slowly or even crash.

At times, they can even be dangerous because some pop-up programs can steal passwords. Last month, California's legislature passed an antispyware bill that bans unauthorized installation of spyware on unsuspecting computer users.

"Spyware remains a serious problem for consumers. But the upside is that consumer awareness of the threats posed by spyware is rising," David Moll, CEO of Webroot, said in a statement.

EarthLink distributes free copies of antispyware software such as its SpyAudit and Spyware Blocker and Webroot's Spy Sweeper to its customers.