Trojan Zlob Virus.

Went to the brother in laws last night. My mrs logged on to her son's bebo account to show him some photo's. Then somehow sent herself a message to her own profile which was a copy of a message already recieved. Anyway, when we got home she logged on again( on our laptop). The message was there and will not delete. Now we have alerts flashing up and 2 antivirus scanners we dont want. We have AVG which is updated everyday. How the fook do we remove this crap as we are stuck.:confused: