你真不幸
资料显示某些用户安装 SP1 时也曾引发过与之类似问题。虽然现在你的是 SP2，但是我怀疑是同一个原因导致的。
微软知识库第329441号文给出了这个问题的解决方案，建议你尝试一下——
以下是329441号文解决方案的摘要，其全文可以在
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q329441 找到：
Quote:
You Cannot Create a Network Connection After You Restore Windows XP
applies to:
Microsoft Windows XP Professional
Microsoft Windows XP Home Edition
If you install Service Pack 1 (SP1) for Windows XP and then use the System Restore feature to restore Windows to a state before the installation of the service pack, you may experience the following symptoms:
You cannot create a remote access or Dial-Up Networking connection. All items on the "Network Connection" page of the New Connection Wizard are unavailable (dimmed).
The Network Connections folder is empty.
The Internet Connection Sharing (ICS) and Internet Connection Firewall (ICF) services do not start because of a dependency failure.
The following events are displayed in the System log of the Event Viewer:
Date: date ? ? ? Source: Service Control Manager
Time: time ? ? ? Category: None
Type: Error ? ? ? Event ID: 7023
User: N/A
Computer:
Description:
The Remote Access Connection Manager service terminated with the following error:
Access is denied.
===============================================================
Date: date ? ? ? Source: RASMAN
Time: time ? ? ? Category: None
Type: Error ? ? ? Event ID: 20035
User: N/A
Computer:
Description:
Remote Access Connection Manager failed to start because it could not create buffers. Restart the computer.
Access is denied.
When you try to start the Remote Access Connection Manager service, you receive the following error message:
Could not start the Remote Access Connection Manager service on Local Computer.
Error 5: Access is denied
To resolve this problem, reinstall SP1 for Windows XP. If you cannot reinstall SP1, start Registry Editor, and then locate the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan
Export the RasMan subkey as exported rasman key. To undo the editing of this registry key, double-click the "Exported rasman key.reg" file that you just saved. Note the Data value for the ObjectName item. If this value is not LocalSystem, modify the ObjectName item to change the value data to LocalSystem. Locate the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\PPP\EAP
Delete the following registry keys under the EAP subkey: 25 26
Quit Registry Editor, and then restart your computer.
source: http://www.pctechnicians.ca/help/w2ktips.html
cf:http://support.microsoft.com/default.aspx?scid=kb;en-us;Q329441
