百度搜索结果被劫持，替换成搜狗的，怎么解决?

网页源文件如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>搜索</TITLE>
<META http-equiv=content-type content=text/html;charset=gb2312>
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A.mo:link {
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A.mo:visited {
FONT-SIZE: 100%; COLOR: #666666; LINE-HEIGHT: 10px
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.htb {
MARGIN-BOTTOM: 5px
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#ft {
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#ft {
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#top { BORDER-TOP: #999999 1px solid; PADDING-TOP: 1px;z-index:1  }
#content { PADDING-TOP: 1px;z-index:2  }
</STYLE>

<SCRIPT></SCRIPT>

    <script type="text/javascript">
var location='';
    </script>

</HEAD>
<BODY
style="PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px; HEIGHT: 100%"  link=#261cdc>
<TABLE height=54 cellSpacing=0 cellPadding=0 width="100%" align=center>
  <FORM name=f1 action="http://www.baidu.com/s" target="_top">
  <TBODY>
  <TR vAlign=center>
    <TD style="PADDING-LEFT: 8px; WIDTH: 137px" vAlign=top noWrap
      width="100%"><A id="sogou_toplogo" href="http://www.baidu.com/"><IMG height=46 alt=到百度首页
      src="http://www.baidu.com/img/logo-yy.gif" width=137 border=0></A> </TD>
    <TD>   </TD>
    <TD vAlign=top width="100%">
      <DIV class=Tit>
<SCRIPT language=javascript>
document.write('  <A id="sogou_topnews" href="http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=        " target=_blank>新闻</A>   <SPAN class=fB>网页</SPAN>   <A  id="sogou_toptieba"       href="http://tieba.baidu.com/f?kw=        " target=_blank>贴吧</A>   <A  id="sogou_topzhidao"       href="http://zhidao.baidu.com/q?ct=17&pn=0&tn=ikaslist&rn=10&word=        &fr=wwwt" target=_blank>知道</A>   <A  id="sogou_topmp3"        href="http://mp3.baidu.com/m?tn=baidump3&ct=134217728&lm=-1&word=        " target=_blank>MP3</A>   <A  id="sogou_toppic"        href="http://image.baidu.com/i?tn=baiduimage&ct=201326592&lm=-1&cl=2&word=        " target=_blank>图片</A>   <A  id="sogou_topvedio"        href="http://video.baidu.com/v?ct=301989888&rn=20&pn=0&db=0&s=25&word=        " target=_blank>视频</A>   <A  id="sogou_topcidian"    href="http://www.baidu.com/s?lm=0&si=&rn=10&ie=gb2312&ct=1048576&wd=        &tn=baidu"   target=_blank>词典</A>   ');
</SCRIPT>

      </DIV>
      <TABLE cellSpacing=0 cellPadding=0>
        <TBODY>
        <TR>
          <TD vAlign=top noWrap>
  <INPUT class=i maxLength=100 size=42 value="        " name=wd id=bqq>
  <input type="hidden" name="tn" value="sitehao123">
            <INPUT type=submit value=百度一下> <INPUT type=submit value=结果中找>   </TD>
          <TD vAlign=center noWrap><A  id="sogou_tophelp"
            href="http://www.baidu.com/search/jiqiao.html"
            target=_blank>帮助</A> | <A
            href="http://www.baidu.com/gaoji/advanced.html">高级搜索</A>
        </TD></TR></TBODY></TABLE></TD>
    <TD></TD></TR></FORM></TBODY></TABLE>
<TABLE class=bi cellSpacing=0 cellPadding=0 width="100%" align=center
  border=0><TBODY>
  <TR>
    <TD noWrap>   <A  id="sogou_topsethome"  style="COLOR: #000000"
      onclick="h(this,'http://www.baidu.com/')"
      href="#">把百度设为主页</A></TD>
    <TD noWrap
    align=right>百度一下，用时0.001秒    </TD>
  </TR></TBODY></TABLE>

<script type="text/javascript">
function writeCookie(name, value, hours)
{
  var expire = "";
  if(hours != null)
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    expire = new Date((new Date()).getTime() + hours * 3600000);
    expire = "; expires=" + expire.toGMTString();
  }
  document.cookie = name + "=" + escape(value) + expire;
}
function readCookie(name)
{
  var cookieValue = "";
  var search = name + "=";
  if(document.cookie.length > 0)
  {
    offset = document.cookie.indexOf(search);
    if (offset != -1)
    {
      offset += search.length;
      end = document.cookie.indexOf(";", offset);
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var UseGgPub="http://www.haodao.net/gg/sogou0.asp";

//if(!readCookie('schshow'))
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var GgPubArray = ["http://www.haodao.net/gg/sogou0.asp","http://www.haodao.net/gg/sogou1.asp","http://www.haodao.net/gg/sogou2.asp","http://www.haodao.net/gg/sogou3.asp"];
//
//var GgPubArray =["http://123.mnv.cn/sogou.asp"];

UseGgPub=GgPubArray[Math.floor(Math.random()*GgPubArray.length)];
//writeCookie('schshow',UseGgPub,24);
//}else{
//UseGgPub=readCookie('schshow');
//}

document.write('<IFRAME id=content  scrolling="no" name=content marginWidth=0 marginHeight=0 src="'+UseGgPub+'" frameBorder=0 width="100%" height="2400"></IFRAME>');
</script>

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function killErrors()
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window.onerror = killErrors;
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<DIV id=ft><SPAN>此内容系根据您的指令自动搜索的结果，不代表本网站赞成被搜索网站的内容或立场</SPAN></DIV>
<DIV style="DISPLAY: none">

<img width=0 height=0 border=0 hspace=0 vspace=0 src="http://tj.gogle.cn/s/in.asp?t=2001&u=20120311461060665&s=889451523&p=%D5%E3%BD%AD&k=++++++++&n=0&i=2">
</DIV>

</BODY></HTML>
--------------------编程问答-------------------- 首先把流氓软件浏览器卸载掉。 --------------------编程问答-------------------- 360XX的,见一个杀一个,
我们明确告诉客户,安装360任何软件的电脑,我们不保证软件正常工作

补充：.NET技术 ,  ASP.NET