From the Symantec website:
Symantec.com > Norton > The Conficker Worm
The Conficker Worm
Target: All users of Windows XP and Windows Vista.
A new worm called Conficker, sometimes referred to as Downadup, has generated a lot of interest. Current users of Symantec’s Norton security products are protected. Users who lack protection are invited to download a trial version of Norton AntiVirus 2009, Norton Internet Security 2009 or Norton 360. All of these products will detect and remove this worm.
What does the Conficker worm do?
The Conficker worm mostly spreads across networks. If it finds a vulnerable computer, it turns off the automatic backup service, deletes previous restore points, disables some security services, blocks access to a number of security web sites and opens infected machines to receive additional programs from the malware’s creator. The worm then tries to spread itself to other computers on the same network.
How does the worm infect a computer?
The worm tries to take advantage of a problem with Windows (a vulnerability) called MS08-067 to quietly install itself. Users who automatically receive updates from Microsoft are already protected from this. The worm also tries to spread by copying itself into shared folders on networks and by infecting USB devices such as memory sticks.
Who is at risk?
Users who’s computers are not configured to receive patches and updates from Microsoft and who are not running an up to date antivirus product.
What to do if you are infected
Detailed removal instructions are available here: http://www.symantec.com/security_response/writeup......mp;tabid=3
Advice to Stay Safe from the Conficker Worm:
Run a good security suite.
Keep your computer updated with the latest patches. If you don’t know how to do this, have someone help you set your system to update itself.
Don’t use “free” security scans that pop up on many web sites. All too often these are fake, using scare tactics to try to get you to purchase their “full” service. In many cases these are actually infecting you while they run.
Turn off the “autorun” feature that will automatically run programs found on memory sticks and other USB devices.
Be smart with your passwords. This includes
changing your passwords periodically
Use complex passwords – no simple names or words, use special characters and numbers
Using a separate, longer password for each site that has sensitive personal information or access to your bank accounts or credit cards.
Use a passwords management system such as Identity Safe (included in Norton Internet Security and Norton 360) to track your passwords and to fill out forms automatically.