The new Windows 7 beta release just like Vista preview releases before it incorporate some additional UI elements meant for testers to submit feedback back to Microsoft.
Now considering you may be running this Beta 1 release as your main OS for some reason (I admit it, I have given in to the temptation many times before), one of those elements in particular can become annoying and obtrusive to your otherwise neat configured desktop.
Here’s how to remove the Send Feedback link:
(1) Run the Registry Editor (type regedit on the start run menu)
(2) Browse to the following registry key: HKEY_CURRENT_USER\Control Panel\Desktop
(3) If it’s not already there, add a new DWORD (32-bit) value “FeedbackToolEnabled” and set its data field to 0.
(4) The change should take effect on your next restart.
An alternative way to do this is and to remove wallpaper watermark from the beta.
The process for doing this is i recommend you do is download this utility that will take care of everything for you -
notice however this is only meant to work with Windows 7 Build 7000 (Beta 1).
To get Genuine windows 7 check this post.