Can not use my external hard drive

[lamiaheart]

I have bought a seagate 500gb external hard drive of which i am able to fill only 117 gb. Rest is unfilled. Now whenever i try to insert any kind of file( games movies songs etc.) a message pops up saying that i need to take permission from administrator. When i continue it then again a message comes and it bluntly denies my request. Hence i am unable to pour data into my external hard drive.
But I have full access to the already stored data that is i can watch movies which have already been stored in that hard drive. But the probelem is i can not bring new files to it due to this administrator problem. Please suggest a remedy ASAP

 

[bassfisher6522]

You can take ownership of the drive, that should allow you access. Download the zip file and follow instructions. It's a very handy tool.

http://www.sevenforums.com/tutorials/1911-take-ownership-shortcut.html