Hi sleepy,
You will find this option in the 'Ease of Access Center'. To get to this,
click the start orb and type 'ease of access center' into the search box. In
the 'Programs' section of the results panel, you will find this item
displayed. Select it. Under the section headed 'Explore all settings', select
'Make the computer easier to see'. This brings up another dialogue page. On
this page, there is a section headed 'Make things on the screen easier to
see' and one of the options here is 'Set the thickness of the blinking
cursor:' with a dropdown selection box next to it. Select the required
thickness of cursor from this box and check the preview that is displayed.
When you have selected the required thickness, click 'Save' to store your
changes and then close all open windows.
Dwarf