While Lozzo's post may be true, regarding it being the result of remnants of the XP Antivirus 08. I've personally never encountered this particular
"error" after having removed that piece of crapware, something I've had to do for clients many times recently. Actually, some of the variants do
much more than merely disabling tabs in display settings and adding the desktop background "alert".
One of the worst I've necountered removed access to "C" drive in My Computer. Removed "Control Panel", "Help & Support", and "Run" from the
start menu. Disabled access to both Task Manager and Regedit. Added "VIRUS ALERT" to the end of the clock display. As well a myriad of other
registry changes intended to prevent it's removal.
ANYWAY... back on topic.
There is a "hotfix" available from Microsoft for this particular issue as well as an MS Support Doc with step-by-step directions of what you'll
need to do after having applied the "hotfix".
You can find both the "hotfix" and the step-by-step directions, here:
http://support.microsoft.com/kb/906866
The hotfix link is at the top of the page under "Hotfix Download Available" and the directions specific to Windows XP are further down under the
"Hotfix information for Windows XP" heading.
Specifically:

After you install this hotfix, modify the DfsIrpStackSize registry entry. To do this, follow these steps:1. Click Start, click Run, type regedit,
and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Mup\Parameters
3. In the right pane, right-click DfsIrpStackSize, and then click Modify.
Note If the DfsIrpStackSize registry entry does not exist, you must create it. To do this, follow these steps:a. On the Edit menu, point to New, and
then click DWORD Value.
b. Type DfsIrpStackSize, and then press ENTER.
4. In the Base box, click Decimal, type 10 in the Value data box, and then click OK.
Notes• A value of 10 allows for a maximum of eight file system filter drivers.
• The default value of the DfsIrpStackSize registry entry is 5. A value of 5 allows for a maximum of three file system filter drivers.
• If you set the value to a number that is greater than 10, the value is automatically set back to 5.
• If you do not apply this hotfix, the DfsIrpStackSize registry value is ignored.
5. Exit Registry Editor.
6. Restart the computer.
While the registry edits may seem a bit overwhelming for those who may not be particularly comfortable making these type changes/edits. Rest assured
that as long as you perform each and every step as directed, you should have no problems whatsoever.
Hope this helps. Otherwise, post back and we'll go from there.