I am running ISA 2000 on Windows 2000 Server. When I try to install feature pack 1 I get the following message after the services has stopped. "The program cannot register the rpcfltr.dll file. The specified procedure could not be found." I want to updtae ISA to SP2 any ideas. Did a search in google and only returned what feature pack1 updates nothing on the problem. Any one came accross this before? Thanks a lot for a great message board! 10's