Cannot Access D Drive After Windows 7 64bit Install?

Here is the story. I was running windows 7 ultimate 32 bit version. I decided to install the 64 bit version so i formated my c drive and installed the 64 bit version. All well and good except now i cannot access my d drive. I get a message "access denied". When i was using the 32 bit version i had my d drive permissions set up so that only I, as the administrator could access it and the kids login couldnt. I have gone into the drives properties and made myself the owner but still cannot access it. Also i notice that when looking at the properties it says that the drive it no free space left on it when it actually has about 300 GB left.I have gone into properties and made myself the owner of the drive but the problem is still occuringI have been told the problem is that the permission on the drive were made on the 32 bit install and I and now i am trying to change them in a 64 bit version