Cant Access Old Computer Files

I just recently got a new computer installed with the Vista Home Premium x64 OS. After many failed attempts at transferring my old files i eventually ended up putting my old hard drive into my new computer, and attempted to drag and drop into a folder i created specifically for those files. Upon trying to do this, it transferred all of my program files, but when it gets to my actual documents, where i keep my most important files, it says i need administrative permission to do this.

Then, when i tried to access the files directly in my old hard drive, it said that i couldn't do that, and showed this: "You don't currently have permission to access this folder. Click continue to get access to this folder." "You have been denied permision to access this folder. To gain access to this folder you will need to use the security tab." and then when i use the security tab to transfer file permission to me, it still doesn't do anything.