1.  A pair of well-known viruses, Chernobyl and Melissa, have infiltrated computers via e-mail messages, wiping out data and paralyzing computer systems.

2.  After infiltrating a computer, Klez often drops secondary infections, some accidentally, some on purpose.

3.  But he said the new Java will let hackers create dangerous programs that could infiltrate your computer through the Internet.

4.  Lavoie had to spend the rest of the day cleaning up the mess and plugging the security hole that allowed the computer to be infiltrated.

5.  After infiltrating the computer, he told FBI officials that he was demonstrating the vulnerability of system.

6.  Once it infiltrates a computer, the virus co-opts e-mail files and sends out new infected messages to other e-mail accounts.

7.  When they find a vulnerable site, they can take command of a machine and program it to launch a DoS attack in concert with other similarly infiltrated computers.