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I keep getting this http://s04.cltrda.com/sc?p=YTEwOTY3MTEw

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every time I open something this says Firefox blocked redirecting this http://s04.cltrda.com/sc?p=YTEwOTY3MTEwNTbeR3JnZpjKRpk6zb2GWOJ%2BCz5SiP%2B3AsACMadnUXcFrR1vioSBc0bG3d4B65NP6WVRxXDPjgty1Yi8qrE80Aqi%2FjqGt88Rs7%2FKuVdLnI7J7lq2udsZ2uwVp65s5nbbYQfRljUJwx3gePoSL1%2F8R6NWLkhrSy6ghAce99chid%2BVUJAFVa4kMbkdDsxnroFDC3DEb3%2BISsfjQWKZ5%2FswTr%2BictRdV34B0Z%2F%2BgvgdQaaa9fmJ1Hdo8%2FTsTGGXAoa3RQrqP2Y%2F7o4Zmn8wZSPY7aKirKu7HkZD9v9nh0dhdQudBZQZnDyrD6kUKrcLi8ggLfLMbUU3WSMY7g%3D%3D&t=1

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Do a malware check with some malware scan programs. You need to scan with all programs because each program detects different malware. Make sure that you update each program to get the latest version of the database before doing a scan.

See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and What to do when searches take you to the wrong search website