virus problem

[vcant]

hi guys

i have a strange problem with one of the computers (not mine )

i see that the computer attemps to send out virus to the outlook express contacts (i see it in the mail server log)

but i cannot find the virus itself....

the computer had MCafee installed before it got the virus, after that we put AVG and it found lots of viruses,

but now it says the computer is clean, but i still can see the mails going out ......

i did the online scn as well with 'Bit Defender' and it didnt find anything either....

any ideas?