I have created a document in "notepad." How can I get this document run thru a spell check?

If you have Windows 8 there is a way. If you're using a mouse, enter into your system settings by moving your mouse to the top right corner to access the Charms menu. To do this on a touchscreen, you'll swipe in from the right edge of your screen. Tap or click "Settings," then "More PC Settings." Select the "General" tab, then toggle the on/off switches to enable or disable "Autocorrect Misspelled Words" or "Highlight Misspelled Words." As you type misspelled words in either NotePad or WordPad, your system will now highlight or autocorrect them.

Load it in a program that does spell check, like Libre Office Writer.