The BitDefender Virus Analyse Team has releasead a free removal tool for this particular virus. Important: You will have to close all applications before running the tool (including the antivirus shields) and to restart the computer afterwards. Additionally you'll have to manually delete the infected files located in archives and the infected messages from your mail client.
The BitDefender Antisobig-en.exe
tool does the following:
it detects all the known Sobig versions;
it deletes the files infected with Sobig;
it kills the process from memory;
it repairs the Windows registry.
You may also need to restore the affected files.
To prevent the virus from replicating itself from infected machines to clean machines, you should try to disinfect all computers in the network before rebooting any of them, or unplug the network cables.
If you are running Windows 95/98/Me you will have to apply the following patch
provided by Microsoft to stop the virus from using the Share Level Password