New
#411
This is easy, but may take a while since you haven't done it in awhile.
If you're using Cortana, click on her, else right click the Start Button then Search. Enter DEFRAG, you'll see two, the one you want is the Desktop App. Click it. You'll get a screen similar to mine. Top entry is your HDD. I have a SSD, so just pretend. Make sure that one is highlighted (click if not) and click Optimize. Yours might say Defragment. It will go through several passes, in your case 7-10 or more. It takes a little while, just let it finish and post back when done.