Can't Open Files On Friends Old HDD

Hey guys, my friends computer broke but I was going to recover some of his files. However, when I tried booting in to his OS on my computer it quickly blue screened for half a second and then booted back into my OS. So I used it as a slave drive and tried opening it up to grab the files like that. I could see some of his pictures but others won't load. When I try to click them it says I don't have permission to view them. This is obviously because the account had a password, however I can't boot into the OS to even type in the password which we both know.

Any help with this? 

Yes, the reason is that because those accounts belong to another user on a different instance of an OS. Thankfully you can you pop the hard drive into your computer. all you need to do is connect the hard drive into your computer as a slave drive and take ownership of the files that you want to access.

This Link will show you how to do this.

http://tek.io/17HdUqM