为什么我会溢出失败

我所在网吧的机子都是 Windows XP Service Pack 1
RPC溢出失败
已经启用分布COM
开放端口 135 445 无防火墙
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C:\Documents and Settings\Sicent>netstat -an
Active Connections
  Proto  Local Address       Foreign Address       State
  TCP 0.0.0.0:135          0.0.0.0:0             LISTENING
  TCP 0.0.0.0:445          0.0.0.0:0             LISTENING
  TCP 0.0.0.0:1027          0.0.0.0:0             LISTENING
  TCP 0.0.0.0:1028          0.0.0.0:0             LISTENING
  TCP 0.0.0.0:1839          0.0.0.0:0             LISTENING
  TCP 0.0.0.0:2233          0.0.0.0:0             LISTENING
  TCP 0.0.0.0:18018       0.0.0.0:0             LISTENING
  TCP 10.0.1.115:139       0.0.0.0:0             LISTENING
  TCP 127.0.0.1:1027       127.0.0.1:1839       ESTABLISHED
  TCP 127.0.0.1:1028       127.0.0.1:18018       ESTABLISHED
  TCP 127.0.0.1:1839       127.0.0.1:1027       ESTABLISHED
  TCP 127.0.0.1:18018       127.0.0.1:1028       ESTABLISHED
  UDP 0.0.0.0:445          *:*
  UDP 0.0.0.0:500          *:*
  UDP 0.0.0.0:4000          *:*
  UDP 0.0.0.0:4001          *:*
  UDP 0.0.0.0:6000          *:*
  UDP 0.0.0.0:6001          *:*
  UDP 0.0.0.0:6002          *:*
  UDP 0.0.0.0:6003          *:*
  UDP 0.0.0.0:6004          *:*
  UDP 0.0.0.0:6005          *:*
  UDP 0.0.0.0:7557          *:*
  UDP 0.0.0.0:7560          *:*
  UDP 10.0.1.115:137       *:*
  UDP 10.0.1.115:138       *:*
  UDP 127.0.0.1:1049       *:*
  UDP 127.0.0.1:1255       *:*
  UDP 127.0.0.1:1353       *:*
  UDP 127.0.0.1:1774       *:*
  UDP 127.0.0.1:2225       *:*
--------------------------------------------------------------------------------
从注册表上看系统没有打过补丁相对应的补丁
________________________________________________________________________________
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\HotFix]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\HotFix\KB833509]
"Installed"=dword:00000001
"Comments"="Windows XP 修补程序包 - KB833509"
"Backup Dir"=""
"Fix Description"="Windows XP 修补程序包 - KB833509"
"Installed By"=""
"Installed On"=""
"Service Pack"=dword:00000002
"Valid"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\HotFix\KB833509\File 1]
"Flags"=""
"New File"=""
"New Link Date"=""
"Old Link Date"=""
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\HotFix\Q147222]
"Installed"=dword:00000001
________________________________________________________________________________

Remote Procedure Call (RPC)提供终结点映射程序 (endpoint mapper) 以及其它RPC 服务。已启动自动本地系统
以前溢出可以成功的现在就不可以拉