mirel, can you please read carefully the first posts… We need to know what are you talking about: VRDB or iAVS, translating, the database for recovery after a virus infection (VRDB) or the update of avast! program and virus definitions…
Do you use a firewall? Proxy filter?
I cannot imagine anything else which is causing the update failure…
With the information you gave to us is very difficult to see where the trouble is.