Confiker is a virus reported to be generated on the 1 st of April and generates internet traffic without the knowledge of the users and hence they experience issues like slow browsing. It also restricts access to websites that can help in the removal of the software.
You can directly download the antivirus patch from the following Microsoft link
Windows XP: http://www.microsoft.com/downloads/details.aspx?familyid=0D5F9B6E-9265-44B9-A376-2067B73D6A03&displaylang=en
Windows Vista: http://www.microsoft.com/downloads/details.aspx?familyid=18FDFF67-C723-42BD-AC5C-CAC7D8713B21&displaylang=en
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