Search Engine Problems
See whether the automated tool and manual removal instructions here:
http://securityresponse.symantec.com/avcenter/venc/data/trojan.qhosts.html
BEFORE you disinfect, however, please apply this patch:
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS03-040.asp
which will prevent this issue from recurring by simply visiting a rogue web
site.
If you've missed this one, you may not be up-to-date on critical patches, in
general. Here's Microsoft's recommendations about protecting your machines:
http://www.microsoft.com/security/protect/default.asp
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