Computer users need to watch for new viruses and other threats to the integrity of their systems, analysts said.

"There are two new threats circulating. Both should remind [all of us] to use connectivity devices wisely," said Kevin Isaac, regional director for the Middle East and Africa, Symantec Middle East,

The first threat has been designated "W32.Kelvir.D". W32.Kelvir.D is a worm that spreads through MSN Messenger. Once a machine is infected, the worm will send the following message to all the MSN Messenger contacts on the compromised computer - "haha look at us".