UPDATE: New tool "Remove Watermark" added. Thanks to stavros for mentioning it...
When we install a Beta or RC build of Windows Vista, 7 or Server 2008, or when we install a Beta or RC version of a Service Pack e.g. SP1, SP2, etc, a watermark is shown on Desktop which looks similar to following screenshot:

"Evaluation Copy", "For testing purpose only", "Test Mode", "Safe Mode" or similar text is shown in the watermark on Desktop.
It looks ugly when you use dark wallpapers and becomes irritating sometimes. If you also don't like this watermark and want to get rid of it, here are 2 great tools to remove this watermark:
- Universal Watermark Remover
- Remove Watermark
Universal Watermark Remover
"Universal Watermark Remover" is an excellent small and portable utility created by "Orbit30" which can remove the ugly watermark from Windows Vista, 7 and Server 2008 Desktop. It works for both 32 and 64-bit versions of Windows.

Just download it using the above link, run the EXE file and follow the instructions. You'll need to restart your system to take affect.
Remove Watermark
"Remove Watermark" is another awesome portable tool created by "deepxw" which can remove watermark from Windows Vista, 7 and Server 2008 Desktop. It works for both 32-bit and 64-bit versions. Even it works for all languages and service packs.

Download the ZIP file, extract it and run the correct EXE file for your Windows version. It'll ask for confirmation, press Y to confirm and patch the system file to remove watermark.
64-bit version users will also need to rebuild MUI cache. After patching file, run the tool again and press R to rebuild MUI cache.
PS: You can also manually remove the watermark or customize watermark using following tutorial:
Show Your Desired Text on Desktop by Customizing Windows Watermark (Build Number Info)
This article was posted by VG in following section: Software, Troubleshooting, Windows 7, Windows Vista.
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silvano
I having problems with the watermark, i can’t get rid of that.
I have try the 2 procedure, and they are still they.
help
ilyas
9400gt 1gb handle gx280
Kimolo
Try ashampoo winoptimezer, it has a tweak to enable the watermark to show up as well as hiding it.
Someone
Is there a another link available, current link is to complicated.
VG
^^ Link updated. :)
gary
wow that was incredible its absolutely gone thanks guys it works. just restarted my pc to a new life.
its bin a bother.
Hao Zhang
Um... I ran this, but my firewall blocked it during the process, and now my user32.dll.mui is corrupt. After that I found out that window minimize, maximize, closing, and moving doesn't work. Then I copied the backup over, restarted the computer, it works again. But then another error popped up: In IE 8, I can download a file, but when I try to open it with the "Open" button, it gives me "Windows cannot find the specified device, blah blah blah" Is this directly related to the fact that this program failed?
Hao Zhang
^^ What else does it corrupt? I need to somehow restore them!
VG
^^ No. IE error is not related with the program. Since the program patches system file and your firewall blocked it in the middle of operation, the file got corrupted and you faced those weird problems.
Try to disable firewall and then run the patch.
Ganesh
dude its only for activated full version of windows ... u are using the RC stilll