In recent versions of Windows including Vista, 7 and Server 2008, Microsoft has implemented a watermark imprint on RC (release candidate) and test copies to remind you that you’re not using a full version. A watermark will also appear if the copy of Windows is not genuine. For example, “Evaluation Copy” for unactivated Windows, “For testing purpose only” for beta or release candidate software, “Test Mode” when test signing mode is turned on, and “Safe Mode” when user presses F8 to boot into Safe Mode.

Not many people likes these watermarks though, and here’s how to remove them:
WARNING – Proceed at your own risk. Any damage you do is your own fault!
If you need help, just scroll down and post a comment.
Download ResHacker.
Restart your computer in Safe Mode (this is usually done by pressing F8 on the keyboard during the boot process).
Go to C:\Windows\Wystem32\en-us\ and right click on user32.dll.mui
Right-click the file and select properties and click the ‘Security’ tab. Next, click ‘Advanced’ then the Owner tab then ‘Edit’ and click your username then click ‘Apply’ then ‘Ok’.
Open the properties of the same file again, under the security tab select ‘Edit’ then click Users & then click the checkbox to ‘Alow’ full control then ‘Apply’ ‘Ok’
For x64 version you will need to edit the user32.dll.mui in c:\windows\SysWOW64\en-us\ too
Now, in ResHacker, open user32.dll.mui and go to String Table\45\1033 then scroll down to find:
STRINGTABLE
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
{
705, "&Reconversion"
706, "shutdown"
707, "power off"
708, "restart"
709, "unknown"
710, "Windows"
711, "If you shut down this remote computer, no one can use it until someone at the remote location manually restarts it.\n\nDo you want to continue shutting down?"
712, "Other people are logged on to this remote computer. Shutting down Windows might cause them to lose data. Also, someone at the remote location will have to restart the computer manually.\n\nDo you want to continue shutting down?"
713, "Other people are logged on to this computer. Shutting down Windows might cause them to lose data.\n\nDo you want to continue shutting down?"
714, "Other people are logged on to this computer. Restarting Windows might cause them to lose data.\n\nDo you want to continue restarting?"
715, "%wsWindows %ws"
716, "%ws Build %ws"
717, "Evaluation copy."
718, "For testing purposes only."
719, "Safe Mode"
}
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Remove everything within the “” for 715, 716, 717 & 718 and click ‘Compile Script’. This will alter the text to:
STRINGTABLE
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
{
705, "&Reconversion"
706, "shutdown"
707, "power off"
708, "restart"
709, "unknown"
710, "Windows"
711, "If you shut down this remote computer, no one can use it until someone at the remote location manually restarts it.\n\nDo you want to continue shutting down?"
712, "Other people are logged on to this remote computer. Shutting down Windows might cause them to lose data. Also, someone at the remote location will have to restart the computer manually.\n\nDo you want to continue shutting down?"
713, "Other people are logged on to this computer. Shutting down Windows might cause them to lose data.\n\nDo you want to continue shutting down?"
714, "Other people are logged on to this computer. Restarting Windows might cause them to lose data.\n\nDo you want to continue restarting?"
719, "Safe Mode"
}
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Next click File & Save, this will create a user32.dll_original.mui and save the new file.
You may need to run mcbuilder.exe to rebuild the MUIcache to get rid of the watermark after making the change to user32.dll.mui.
Restart your machine in normal mode and the watermark will be gone.