Not enough server storage
Not enough server storage is available to process this command.

Not enough memory to complete transaction. Close some applications and retry.

These error messages can indicate the IRPStackSize bug on the other machine (the server that has the share). On that computer open the event log and check for event ID 2011. If this is present, it is a strong indication for this particular bug.

To repair it, you have to reset the IRPStackSize parameter back to its default value of 15 on the server where the share is.

HKEY_LOCAL_MACHINE
 \SYSTEM
  \CurrentControlSet
    \Services
     \lanmanserver
      \parameters

Check for the presence of a value named IRPStackSize. If it doesn't exist, create it as type DWORD. With base set to decimal, enter the value 15.

Reboot the computer.

One frequent culprit is Norton AntiVirus, which tends to change this parameter.

Check also this Microsoft Knowledge Base article. It does not mention Windows XP, but applies to XP as well.

Antivirus Software May Cause Event ID 2011 (Q177078)
http://support.microsoft.com/kb/177078