cant play knights online

From: majestyk25 (majestyk25_at_discussions.microsoft.com)
Date: 06/27/04 

Date: Sun, 27 Jun 2004 06:49:01 -0700

i was playing knights online last week but i had my xp home reinstalled cos of viruses, since then ive tried to download it again from gamespot and gamershell but it wont let me cos i dont have system requirements for a security plug in anymore. help, what am i missing and where to get it from