请大家帮我看下我这个代码是怎么了

<!--#include file="conn.asp"-->
<%
user=request.Form("user")
email=request.Form("email")
pwd=request.Form("pwd")

if InStr(ucase(user),"=")>0 or InStr(ucase(user),"`")>0 or InStr(ucase(user)," ")>0 or InStr(ucase(user),"　")>0 or InStr(ucase(user),"'")>0 or InStr(ucase(user),chr(34))>0 or InStr(ucase(user),"\")>0 or InStr(ucase(user),",")>0 or InStr(ucase(user),"<")>0 or InStr(ucase(user),">")>0 then
response.write "<script language=JavaScript>" & chr(13) & "alert('不能含有空格、<、>、=、引号、半角逗号、反斜杠等字符。');" & "history.back()" & "</script>"
response.end
end if

if InStr(ucase(user),"&")>0 or InStr(ucase(user),"=")>0 or InStr(ucase(user)," ")>0 then
response.write "<script language=JavaScript>" & chr(13) & "alert('帐号中包含非法字符！');" & "history.back()" & "</script>"
response.end
end if

Set rs = Server.CreateObject("ADODB.Recordset")
sql="select * from 个人资料 where 帐号='"&user&"'"
rs.open sql,conn,1,3
if not rs.eof then
response.write"<SCRIPT language=JavaScript>alert('用户名重复，请重新选择一个用户名！');"
response.write"javascript:history.go(-1)</SCRIPT>"
end if
rs.close
%>

麻烦高手看下
同一用户名重复注册
我是菜鸟请高手帮忙

没有说明问题，问题是什么？

问题是同一用户名重复注册