Windows – How to re-enable cut/paste in Windows 7 after accidentally deleting a key in registry

Update: Solved

Please see Accepted Answer, comments, updates & other wonderful answers.

original Question:

The Problem:

If I use Ctrl+C on a file/folder, that icon gets fade, (expected), but then when I press Ctrl+V, nothing gets pasted, nothing happens. it looks like the clipboard function of windows is not getting any input. The Paste & Paste Shortcut option always stay grayed out :

The different scenarios I have tried:

1. Copy option from mouse-right-click menu does not work.
2. Copy option from Organise item (Top menu Bar) does not work.
3. Using Keyboard Shorcuts for Cut/Copy/Paste does not work.
4. Drag & Drop a file to another folder also does not work, and even the dragged file icon stays on the display in faded colour, until I drag any other file (& that file's icon stays on screen) (screenshot below).
5. Dragging a file into Chrome for uploading to Imgur also does not work. Nothing happens.
6. Copy any text from any text file in Notepad/Word/Notepadd++/Chrome and pasting in similar type of location (inside the file) works.
7. Opening an image in Paint, Selecting a portion of it & selecting Copy gives an error alert Unspecified Error.
8. Selecting Send to > Desktop as Shortcut works from any file in context menu.
9. Sticky Keys , Mouse Keys, Toggle Keys in Control Panel are all off.
10. In all of above scenarios, Copy can be replaced with word Cut

Solutions I have tried:

This registry entry from www.tenforums.com from Google Results, to add a Copy To option in context menu works, but after clicking it, it displays a dialog to specify the folder in the whole system tree.

; Copy To folder
[HKEY_CLASSES_ROOT\AllFilesystemObjects\shellex\ContextMenuHandlers\{C2FBB630-2971-11D1-A18C-00C04FD75D13}]

Everything works as expected in other windows account, so the last option for me could be to make a new Windows Account?

The Problem Source I think:

I was cleaning Registry with CC Cleaner, it said one orphan key, & asked me if I want to backup, I said no, & it deleted that key. The name of that key was almost similar to {C2FBB630-2971-11D1-A18C-00C04FD75D13} (in structure, not actual letters).

So, please help me to find that one Registry Key to get the Paste & Paste Shorcut menu options back to working.

Update: Will keep updating this as along

1. Tried this solution %windir%\System32\cmd.exe /c "echo off | clip" as suggested at https://superuser.com/a/254347/146781, but did not work.
2. now googling "Clipboard Service Windows 7 Not working"
3. Its ok now, as Google & Eric suggested here & here, Windows ClipBoard Service was stuck, & running that clipboard clear command + reboot fixed all the problems.