How to remove New Folder.exe, SSVICHOSST.exe virus ?

we are using windows xp pro sp2, Norton corporate edition 10.1 with latest definitions. Some of our systems are infected with New Folder.exe, SSVICHOSST.exe virus / Warm. When we insert a removable disk it creates 2 files / folders New Folder.exe, SSVICHOSST.exe by its own. It looks like a folder. It is also creating a .exe file in each subfolders with the folder name. My current antivirus is not finding the virus. avast is saying this as w32.sohanand-O [Wrm] and deleting these files but this is not protecting the system. we are unable to open task manager, cmd, msconfig, regedit. Please help us...

Thanks in advance.

How to remove New Folder.exe, SSVICHOSST.exe virus ?nortan

SSVICHOSST.EXE can also use the following file names:

* 34340538.EXE

* BUZZ(27_5_07)BANO.EXE

* SRC.EXE

* CLASSES.EXE

* BUZZ.EXE

* BAK.EXE

* NEW FOLDER.EXE

* PROJECT.EXE

* REAL PLAYER.EXE

* FINALIZED.EXE

* WINDOWS MEDIA PLAYER 10.EXE

* SHOAIB DOC.EXE

* HIKA NEW BORN.EXE

* AWA WED.EXE

* HOME PIC.EXE

* SULE.EXE

* RED ERATHE SWATCH.EXE

* HAROON.EXE

* MAJU CONVICATION.EXE

* MAJU.EXE

* CARS.EXE

* PICTURE.EXE

* NEW FOLDER (8).EXE

* NEW FOLDER (12).EXE

* APPLICATION DATA.EXE

* SIS SD.EXE

* FONT.EXE