Good day.  I have a problem with playing Ragnarok online. well i dont know why its not working on my OS now. the client is still working when i got window 7 OS, but now when i reformat my laptop, to window XP sp3. there is problem with the setup.exe.  thats why i cant play.  This is my laptop specs,   
  Ive tried the tricks on the thread sir you've posted but still its not working.  this is the tricks ive done.    
  I downloaded the latest KRO client. and also have patch it. and i also tried the ROext. still not working .with the running as administrator i guess its not a problem with the OS im using. and also ive tried shutting down my Anti- Vrus and Firewall cause i thought they have something to do with this but still not working.  hoping sir for your help.   I want to play badly. Hahaha.~ Thank you in Advance  Regards, Android