isapi 的dll在98 下可以操作注册表，为何在win2000下就不行呢?

我做好的isapi 的dll,在主执行文件main.dll里面加上时间限制的代码，在注册表里
写入了一些时间和次数值 ，调试好后在win98的pws环境里启动主页面 正常，观察注册表
结果也正确，只是将操作系统换为win2000就执行不了，去掉操作注册表的代码就可以了。
本人一时愚昧，望各位尽力帮助！谢谢！代码如下：  flag:=false;
  ln_useSum:=0;
  Datetimetostring(newstring,'yyyy-mm-dd',date());  Registry:=TRegistry.Create;
  Registry.RootKey:=HKEY_LOCAL_MACHINE;
  registry.OpenKey('\Software\newsoftworkshop\yourdog\nmsrd1', True);  lc_secstr:=datetostr(date()-521);  lc_readstr:=lc_secstr;  if Registry.valueExists('nmsrdinitdate') then
  begin
     lc_readstr:=Registry.ReadString('nmsrdinitdate');
     lc_readstr :=datetostr(strtodate(lc_readstr)+521);
     flag:=true;
  end
  else
     Registry.WriteString('nmsrdinitdate',lc_secstr);  if not Registry.valueExists('nmsrduseSum') then
         Registry.WriteString('nmsrduseSum','0');
  if (flag) and (comparestr(lc_readstr,newstring)<>0) then
     begin
        ln_useSum:=strtoint(Registry.ReadString('nmsrduseSum'));
        ln_useSum:= ln_useSum +1;
        Registry.WriteString('nmsrduseSum',inttostr(ln_useSum));
        lc_secstr:=datetostr(date()-521);
        Registry.WriteString('nmsrdinitdate',lc_secstr);
     end;  Registry.Free;
     if ln_useSum >4 then
        response.content:='对不起，系统使用时间(五天)已结束！请尊重软件人员的劳动。'
                          +'<br>'+'请向软件提供商索取付费后的执行文件！'
     else
       begin          if trim(getuserID(query2,request))='' then
             response.Content:=first.Content
          else
             response.Content:=logon.content;       end;