I would run a virus scan, and then a malware scan to make sure that you aren't infected. That's a malicious site, and your computer may have some sort of malware and/or adware on it that's making you direct to that page.
Also, it doesn't help that you're running Windows XP either, for the record. XP has been off of "life support" since April of last year, meaning no more security updates come from Microsoft for it. This in turn causes vulnerability issues for your computer, which in turn allows you to get infected faster. If you are able to, I would at least upgrade to something newer than Windows XP, even if it's just Windows Vista. I'm not saying you should ditch XP, but at the same time, I highly recommend it no longer be used for everyday usage because of the vulnerabilities it has to viruses and other worms.