In order to fix the IP address on your Windows PC,  you should always login to the Desktop as Administrator. 

  •  Then press Windows button on the keyboard: 

  • And type CMD > press Enter > type ipconfig > find the IP address, Subnet and Default Gateway values.
  • Press again Windows button on the keyboard, choose Settings> Network and internet > Network adapter options> choose used network interface > right-button click on it and select Properties > choose Internet Protocol Version 4 (TCP/IPv4) > press Properties.

In the window shown below, please select Use the following IP address, enter IP address, Subnet mask and Default gateway values:

Then press OK.