Steps:

• Click "Start"
• Click "All Programs"
• Click "Windows Defender" (Click Example: 1)
• Click Drop Down menu next to scan button and Click "Full Scan" (Click Example: 2).

Example: 1

Example: 2

• When the scan is finished click to clean infected files.
  

Note: Depending on the amount of adware that has infected your computer this process may several minutes.