Windows Live Writer Tip #4 – © and ® Characters
From inside of Windows Live Writer you can easily add a copyright or registered symbol using typographic replacement.
To insert a © type a (c) and then press space.
To insert a ® type a (r) and then press space.
If you actually want to type those exact characters you can hit backspace after it does the replacement and it will convert it back to parenthesis version.
This feature doesn't include the trademarked symbol unfortunately.