Cant fully access old windows xp boot HD as slave in new Windows 7 PC

Hello, I recently build a new computer with a lot of help from this community (thanks again). I used an SSD for the boot drive and I added a 3tb drive for storage. I temporarily installed the hard drive I booted Windows XP from on my old PC so I could transfer files over to the 3tb drive but I did not have access to most of the files. The drive was basically full and it shows in the windows 7 machine as barely having any data. I'm guessing the data to my profile is locked away and I need some permission setting because the drive was not failing.

If you know what to do I would really appreciate a hint, thanks!