The short answer is that Windows 10 does not include the clipboard viewer. The long answer(s) are:
A) COPY CLIPBRD.EXE FROM A WINDOWS XP COMPUTER:
- You can download the Windows XP Clipboard Viewer from HERE or you can just copy C:\WINDOWS\SYSTEM32\CLIPBRD.EXE from any Windows XP computer.
- Put CLIPBRD.EXE into C:\PROGRAM FILES (x86)\ on your Windows 10 computer
- Create a shortcut if you wish, or just double click it
- Ignore the error about the CLIPBOARD SERVICE IS NOT STARTED and expand the minimized window in the corner to see what is in your clipboard