One time the XP upstairs in our house had some trojan on it,my father was doing something and some page said he "You need this codec to watch this clip" (YOU DIDNT NEED IT BUT HE DIDNT KNOW THAT (LIKE ALOT OF PEOPLE ))

Well good thing i went up to that room that night @ 2am!!

The trojan was actively attacking OTHER COMPUTERS FROM THE XP!!

I pulled the modem from the feed STRAIGHT AWAY! (It had COMPLETE CONTROL over the computer (It was a STEALTH trojan)) I opened task manager and started '"ENDING TASK" on random things i didnt recognize,when i ended task on the TROJAN'S EXE,the AV recognized and deleted it straight away!! (Norton was on there @ the time,now SPY SWEEPER is on there)

Then i went thru and deleted the folder that was created by the thing (Video ACTIVE-X object),i checked the reg and it was clean. I did a FULL VIRUS SCAN (Which was clean),I rebooted the computer and was greeted with "The system has recovered from a fatel error"

Makes ya feel good when you can do stuff yourself and MANUALLY without the help of commercial S/W that may or may not work..... (Doing things your familar with is sometimes better to do (Opposed to using S/W that you dont know what its doing))