To solve this problem follow this points:
1- Put the pointer of mouse in any place in desktop ( blank space ).
2- press right button .
3- then properties.
4- go to appearance .
5- then you will see " Item " .. press on the arrow.
6- chooce the " Icon".. then you can solve you fonts as you like
i think the standared icon's size is 32 and the fonts will be " Tahoma " and the size will be 8.