Question : Group Policy not applying to XP Machines


I am trying to deploy a group policy.
its a registry setting.
For some reason this setting is only being applied to Windows 7 machines and some XP machines. Same user and the computer accounts are in the same OU. I just loaded a new machine (XP Pro) and it is doing the same thing.  i tried gpupdate /force and it just says to reboot for the settings to take effect.
when I run gpresult it shows the group policy has applied but I dont see it.

Domain Controllers Windows 2008 R2
Domain Mode (2k8)
Group Policy:
User Configuration (Enabled)hide
Windows Settingshide
Wallpaper (Order: 1)hide
Action Update
Key path Control Panel\Desktop
Value name Wallpaper
Value type REG_SZ
Value data \\ag-backup\NETLOGON\desktop.bmp

OptionsStop processing items on this extension if an error occurs on this item No
Run in logged-on user's security context (user policy option) No
Remove this item when it is no longer applied No
Apply once and do not reapply No

I recieved this error one 2 machines in the event log but its also not happening on all machine.

Event Type:      Warning
Event Source:      Group Policy Registry
Event Category:      (2)
Event ID:      4098
Date:            2010/06/23
Time:            11:04:39 AM
User:            NT AUTHORITY\SYSTEM
Computer:      XXXXXX
The user 'Desktop' preference item in the 'Desktop Wallpaper {938E027F-24B3-452C-ABA4-8646F7AE2865}' Group Policy object did not apply because it failed with error code '0x80070057 The parameter is incorrect.' This error was suppressed.

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Please Assist and let me know If you need any furture information. I hope the question is clear.

Answer : Group Policy not applying to XP Machines

Do the xp machine that its not being applied to have the group policy client side extensions installed.
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