Viruses are surely a way to bring you headaches or a way to can harm your computer after they infect the entire system .

Many users are already using antivirus solutions but, it's obvious, some of them are still vulnerable to viruses. Why? Because the programs' engines are not so developed, because the database is not updated very often and many other reasons that can motivate the vulnerability of a computer.

Because the autumn season is now ended, Kaspersky Lab decided it's the perfect time to publish an advisory containing the Top 20 Viruses of November, a top that is led by a new entry.

"Autumn 2006 was a stormy season. For the third month in a row there's not only a new leader in our rankings, but the entire Top Twenty is once again in a state of flux. However, worms from the Warezov family were the main troublemakers, just as they were last month," Alexander Gostev, Senior Virus Analyst, Kaspersky Lab, said.

"In November, Warezov.gj, a newcomer, took first place. This worm, which was first detected on November 22nd, only took one week to become the most widespread virus in email traffic, with an impressive share of over 18%! Only a few malicious programs have shown such record propagation rates in the first month of their existence - and all of them remained at the top of the charts for significant periods of time.

However, I believe this won't be the case this time. Warezov.gj will probably fall sharply in December as the worm surrenders to the onslaught of its new "siblings" he added.

So, in the next lines, I'll present you the entire Top 20 Viruses presented by Kaspersky Lab: