Now, I suppose you are taking ownership of the folder. yeah?
1. Right click that folder and go to properties
2. Go to Security Tab
and click Advanced (Look At image 1)
3. Go to Owner
Tab (look at image 2)
4. Click on Edit (look at image 3)
(note: If you are administrator you will be prompted with UAC, if limited user UAC with administrator password)
5. Choose your current account (look at image 4)
And now you are owner.
It will be better before changing you remember who was last owner so you will give ownership back when you are done.
P.S. That registry thing was to automate it, but we can do it manually, can't we?
P.S.1 I know it's rubbish tutorial, but I did it in 3 minutes and I am not that good at this like Brink or Mr GRiM.
P.S.2. for my own privacy reasons I had to cover some names, sorry for that.