I'm getting a Windows - Delayed Write Failed message at the lower left of the taskbar when trying to write to server.

Hi Experts,
  I work for a dental office with 9 windows XP workstations and 1 2003 Server. These workstations have scanners/cameras hooked up to them so they can take an xray of a patient and save if in there file which is stored at the server level. Well everything was working great , but yesterday about 3 of the workstations started getting this error messag when they took an xray and wanted to save it on the server or when they scanned a document and wanted to save it to the same location on the server. Here is the exact message that they are getting. A pop up on the lower right of the taskbar comes up and reads:
Windows - Delayed Write Failed
Windows was unable to save all the data for the file \\server\dentrix\dximage\images\4567.vns.
The DATA has been lost. This error maybe caused by a failure of your computer hardware or network
connection. Please try to save this file elsewhere.

Then I looked at even viewer is here are the details:
Date: 8/12/2007            Source: MRxSmb
Type: Warning              Event ID: 50
Description:
(Delayed Write Failed) Windows was unable to save all the data for the file \Device\LanmanRedirector.
The DATA has been lost. This error maybe caused by a failure of your computer hardware or network
connection. Please try to save this file elsewhere.

I clicked on this link http://support.microsoft.com/kb/321733/en-us and it gives me this workaround, which I haven't done because it's not very detailed as it doesn't tell me what to modify in uder parameters.

WORKAROUND
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To work around this problem, turn off SMB signing on the server: 1. Start Registry Editor.
2. Locate, and then click the enablesecuritysignature value under the following key in the registry:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Lanmanserver\Parameters
3. On the Edit menu, click Modify.
4. In the Value data: box, type 0, and then click OK.
5. Quit Registry Editor.
6. Stop and then restart the server service, or restart the computer.

Any help or suggestions will be greatly appriciate it, I think its server related because it's only affecting some of the computers not all.