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I have seen reports that Windows XP is slow when accessing network shares. I use XP daily on my local home network and a corporate LAN. I haven’t noticed the network slowness. But if you do, there are reports that deleting a particular registry key resolved the problem. It certainly works for Windows 2000. You can give it a try in XP. I would backup the key first.
HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/Current Version/Explorer/RemoteComputer/NameSpace/{D6277990-4C6A-11CF-8D87-00AA0060F5BF}
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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To resolve this issue, set the value of the restrictanonymous registry entry to 0. To do this, follow these steps:
Click Start, click Run, type regedit, and then click OK.
Locate and then double-click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
On the right side, double-click restrictanonymous.
Make sure that the value in the Value data box is set to 0, and then click OK.
Close Registry Editor.
Restart the computer.
Note There may be other reasons that you receive this error. For more information, please see the “Similar problems and solutions” section.

To backup and delete the key, In the regedt32 registry editor navigate to the NameSpace key :

Right click {D6277990-4C6A-11CF-8D87-00AA0060F5BF}
Click Export. From the Export Registry File dialog box in the File Name text box :
Type the filename of your choice as in restoreshare
Click Save
This saves the file names (in my example), restoreshare.reg to the My Documents folder. Its now safe to delete the key.
Right click {D6277990-4C6A-11CF-8D87-00AA0060F5BF}
Click Delete
Click Yes in the Confirm Key Delete dialog box.