Your Computer is Infected

I am getting a message on my laptop "Your computer is infected! Windows has detected spyware infection It is recommended to use special antispyware...." and I am unable to log on to the internet. I'm not sure what to do at this point. My laptop has Windows XP. If someone can please help me, I would greatly appreciate it.
 
Please post HijackThis log report here for analysis. Can you post a screenshot of the warning message? I suspect your PC is infected with Spyware and the same Spyware is giving that warning message. That kind of warning is not given by Windows OS.
 
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