Remote IT Support

For Windows XP, Windows 7 you can use Imperius Remote App. Download it here. It's free of charge and very easy to use

For windows 10 you can use in-bulit app Remote help. Bellow you can  find instruction how to find it :

Select the Start  button > Windows Accessories > Quick Assist, or select the search box on the taskbar and type Quick Assist, and then select Quick Assist in the list of results.