The problem there is not with the system32 folder but the file itself presently in use. You would need to boot up in safe mode where the file would be sitting idle.
First however for changing the user account ownership over any driver or folder you right click on the file and open the security tab. Once opened you click on the Advanced button followed by the owner tab on the screen that follows.
One more screen follows that when clicking on the Edit button where you find the system admin account already set. You hightlight your user account seen listed there and click the apply button. Right then you should see the "you have successfully taken ownership" message appear!
Once that window and the others before are closed up you right click again for the properties screen>securty tab and click on the other edit button and click on your user name again followed by checking off the full control box. The image attached here will give you a road map.