Helkern is another name for the "Slammer" or "Sapphire" worm, if your company uses SQL server or MSDE 2000 you will want to read this page:
http://www.microsoft.com/sql/techinf...y/slammer.mspx
The slammer detection and removal tool can be found here:
http://www.microsoft.com/technet/arc...lammerrea.mspx