Step 1: Click File on the top menu, choose Save, and save your document in your Documents folder or you can choose any other location for easy retrieval later. (Pressing the Alt key, followed by the F key and the S key, does the same thing.)
Step 2: Click the Save icon. Hold down Ctrl and press the S key.
If you’re saving something for the first time, Windows asks you to think up a name for your document. Type something descriptive using only letters, numbers, and spaces between the words. (If you try to use one of the illegal characters, Windows will request, request that you use a different name.)
NOTE: Before performing any significant repairs, back up your computer's hard drive.