Go to Add/Remove Programs in the Control Panel -> Click on Add/Remove
Windows Components on the left bar -> on the screen that pops up, select
Accessories and Utilities -> Details Button -> Select Accessories -> Details
Button -> Check mark the box named "Clipboard Viewer" and say OK twice and
then next and let the install finish. Then somewhere in you accessories (in
start menu) you will see a Clipboard Viewer. Open that application and you
will be able to clear the clipboard from there.
OR, if you just want to remove what you have in the clipboard right now,
just open any application like notepad, word, etc. and select one blank
space and press Ctrl+C and it will clear the clipboard for you.