1) Apply security policies in case of Nt mach like 2000 , XP Pro through secpol.msc 2) Keep good antivirus sofware and keep the Singnatures up to date 3) Install Anti-Spyware Tools that detect Hijack's entery in registry forex spware blaster from www.javacoolsoftware.com, Trojan Scan, Spy sweeper 3.02, Ad-aware from Lavasoft 4) Keep complex passwords so that one could not guess it easily.