You can't "move" it.
Find the saved games folder and make a copy of it.
Uninstall Crysis 2.
Re-install Crysis 2 on new drive.
Copy saved games folder back to new installation.
You can move it, use Steam Mover and it will symlink the directories and copy the contents for you. Your saves are in C:\Users\<YOUR WINDOWS ACCOUNT HERE>\Saved Games\Crysis2 so you don't have to worry about moving them.