cheers i have managed to change it now by editing the registry was not as hard as i thought heres how for thoses who dont yet know
Fire up registry editor (Win Key + R and then type regedit, hit enter)
Browse to HKLM\Software\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background , double click on key named OEMBackground and change its value to 1 (If you cannot find the path or the key go ahead and create it, remember
OEMBackground is a Dword)
You just enabled the OEM Background functionality. Now browse to the folder %windir%\system32\oobe\info\backgrounds within Windows explorer. %windir% refers to your Windows install directory
C:\Windows in most systems. Again the folder path may not exist already, so you can go ahead and create required folders (info and backgrounds are generally not present)
Now put in any JPG file with size less than 256 kb in this folder and rename it to backgroundDefault.jpg. This file will be stretched to fit the screen, so you would want it to match the resolution of your screen so that image doesn’t look bad. You can
something like smush.it or Photoshop’s Save as/Save for Web feature to reduce image size.
this was very easy and quick to do
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