With respect. I would also like to add that blindly taking ownershipp of some of the security locked files/folders in Windows 7, can lead to a heap of problems. Worst manisfestation I have seen is a constant duplication of files being used into other linked folders - this invariably leads to a loss, due to OS confusion, of links..
On the subject of links, the (well intentioned) one given by Zvit, is a little old and does not, apparently, show a way to Undo the reg edit. The method of using the shift key is clumsy.
The automatic registry edit (.reg) has been updated.
I have enclosed both the enable and undo files in the attached zip,This gives you a right click item on the drop down menu, for any file or folder. but heed the warning from Trouble
Link Removed due to 404 Error