1. Go to where it says "Start" on your home screen. 
2. Then go to all programs. 
3. After that you go to Accessories. 
4. Then when you are there, you go down to System Tools and  click where it says " 

Character Map

"
5. There you go, just copy paste the letters you like to use.

Thanks a billion :)

I wish to know how on a Mac as well because there are different fonts.
Thank you in advance.

you can also use messletters.com

Thanks mossimo. I'll check it out!