Hi, I am Dave, I will help you with this.
When you run check disk command you need to tell it what drive you want to check and fix
So for example if you want to check drive C you add a space and C and a colon, this is the command to use
chkdsk C:
If you want to check a disk and repair any errors found, then you need to add the /r switch to the command, so this would be the command:
chkdsk C: /r
You can run check disk from inside Windows on all drives (D, E... etc.), except the C drive, because Windows is currently running from that disk
So to check and fix the C drive, this is the method:
Click the power button on your Start Menu
Press the Shift Key and click Restart
Your PC will boot into the Windows Recovery Environment
Go to Troubleshoot - Advanced Options - Command Prompt
Type this command and press Enter, (if you are asked if you want to unmount the drive, confirm you do)
chkdsk C: /r