Windows 7 allows the users to choose from a variety of
themes by using the Themes feature. As we change a
theme, the icons and mouse cursors modify accordingly.
Some of us don't like the icons and mouse cursors to
modify as we change the theme. We want the icons and
cursors of our choice to remain the same even in the new
theme. It is possible to prevent themes from modifying
icons and cursors in Windows 7. There is an easy way to
prevent themes from modifying icons and cursors in
Windows 7. Follow these simple steps in order to prevent
themes from modifying icons and cursors in Windows 7:
Right-click anywhere on the desktop.
Select Personalize.
Click on "Change desktop icons" on the left-hand side of the window
screen.

The Desktop Icon Settings dialog box will appear. Uncheck the box for
"Allow themes to change desktop icons".

Click
on Apply.
Click on the Ok button to close this dialog box.
Many people don't mind if the new theme changes the icons but they
prefer the mouse cursors to remain the same. You can follow the same
procedure with a few changes to prevent themes from changing the mouse
pointers.
Follow steps 1 and 2.
Simply click on the "Change mouse pointers" link from the Personalize
window.

The Mouse Pointers dialog box will appear. Uncheck "Allow themes to
change mouse pointers".