Delayed write failed on Windows 2003 server

Hi,
I have developped a Windows Media encoder using Format SDK writing output
file on a network share folder, and i had this message on the encoder
machine event log :

{Delayed Write Failed} Windows was unable to save all the data for the file
\Device\LanmanRedirector. The data has been lost. This error may be caused
by a failure of your computer hardware or network connection. Please try to
save this file elsewhere.

My encoder is running on two differents configurations (and have the same
problem) :
- Dual pentium 4 hyperthreading on Windows 2003
- Dual pentium 4 on Windows XP

It seems to be a know problem fixed by Windows 2000 SP4 (
http://support.microsoft.com/default...b;en-us;321733 ) but nothing
for XP and Windows 2003.
Does anyone know if there is a patch for those OS ?