ISSET_SE error whilst installing Patch 230

Hi gang,Would anyone please have any idea what causes the following problem using W2K SP3 : I have patched Fly!II up to patch 218 without any problem. However when I try to move towards patch 230, I get the error 'ISSET_SE caused an access violation in SETUP.EXE at 0x00000021'. The MS Knowledge base has no information on this error message for W2K, for W95/98 it was common whilst using Norton anti virus. I have tried the following : 1. closing all programs on the PC using enditall.exe2. disabling my V shield anti virus and restarting3. unzipping fly2update230.exe and installing from there4. installed InstmiW.exe version 2.0I understand that I am missing out a lot of the goodies by being unable to do this upgrade, so any help is very welcome !Frans