Which operating system are you using?
NOrton antivirus will quarantine this virus! If it cant remove it.
If you are usind windows XP do the following.
1.Disable System Restore (Windows Me/XP).
2.Update the virus definitions.
3.Restart the computer in Safe mode or VGA mode.
4.Run a full system scan and delete all the files detected as Backdoor.Coreflood.
5.Delete the value that was added to the registry.
It should be in the following regisrty setting.
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Run
ONLY REMOVE THIS IF YOU ARE OK WITH WORKING IN THE REGISTRY
1.Click Start, and then click Run. (The Run dialog box appears.)
2.Type regedit, and then click OK. (The Registry Editor opens.)
3.Navigate to the key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
4.In the right pane, delete the value that refers to the filename detected as Backdoor.Coreflood.
Exit the Registry Editor.
If you don not know how to turn off XP restore here is Symantecs how to.
http://service1.symantec.com/SUPPORT/tsgen...001111912274039