I.) You intend to modify the file by yourself? Ok, let´s start!

[1.] Create a folder 'C:\user32dll', switch to your '\Windows\System32\xy-XY' folder and copy the user32.dll.mui to your new folder.

[2.] Start ResourceTuner (or a similar program) and navigate to 'c:\user32dll\user32.dll.mui'.
In the treeview panel expand 'String', open Item #45 and modify the strings like in the image below.

Item #45
 restune_str45.jpg ( 69.82K ) Number of downloads: 6018


Do the same for Item #46 and #47.

 restune_str46.jpg ( 30.49K ) Number of downloads: 2840
 restune_str47.jpg ( 34.39K ) Number of downloads: 2660


[3.] After completing all changes save the file and quit ResourceTuner.

That´s all about the modding part..
Now, we want to attach the modified user32.dll.mui to our System.

[4.] In your '\Windows\System32\xy-XY' folder right-click to user32.dll.mui, click on Properties
from the contextual menu select the Security tab.

 attention.png ( 5.14K ) Number of downloads: 411
Notice: Before you are able to change the permission settings you have to get ownership of the user32.dll.mui file!

[5.] Click on the Advanced button. Click on the Owner tab; change your settings and get ownership of that file.
Now you can edit the permission settings on the Security tab to get full access.
Click the OK button to apply your changes.

[6.] Rename the user32.dll.mui to user32.dll.mui.bak.

[7.] Copy our modified user32.dll.mui to 'Windows\System32\xy-XY', Reboot and Enjoy!

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II.) Download the modified user32.dll.mui and run steps 4.-7.

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As Spooky says - there is NO watermark in the RTM version of Vista.

If there is then it's obvious what you've done to cause it, so you shouldn't be asking to start with.