Cannot access shares or printers across the LAN from Windows XP

While you are using a computer that has one of the operating systems that are listed in the "Applies To" section installed, you may experience either of the following symptoms.

• When you try to connect to a network share, you may receive the following error message:
  No network provider accepted the given network path.
• You may also receive the following error message:
  Workstation service terminated with service-specific error 2250

This issue occurs because the Mup.sys file is missing or corrupted.

To resolve this problem, follow these steps:

1. Restart your computer in Safe mode.
2. Use System File Checker with the /scannow parameter to immediately scan and verify the versions of all the system files that Windows File Protection helps protect. You must be logged on as an administrator or as a member of the Administrators group to run System File Checker. You can run the sfc /scannow command to use System File Checker.
3. If you get information about the corrupted Mup.sys file, expand the Mup.sys file from the Windows XP CD to the C:\Windows\System32\Drivers folder. For example, if the CD drive is D, type the following at a command prompt:
   expand d:\i386\mup.sy_ c:\windows\system32\drivers
4. Expand the Mup.sys file from the Windows XP CD to the C:\Windows\System32\Dllcache folder. For example, if the CD drive is D, type the following at a command prompt:
   expand d:\i386\mup.sy_ c:\windows\system32\dllcache
   
   Note You can also use Expand File in the System Configuration Utility (MSCONFIG).
   
   For more information, click the following article number to view the article in the Microsoft Knowledge Base:
   310560 How to troubleshoot configuration errors by using the System Configuration utility in Windows XP

For more information about how to update Mup.sys to the most recent version, click the following article number to view the article in the Microsoft Knowledge Base: For more information about System File Checker, click the following article number to view the article in the Microsoft Knowledge Base: