My windows 7 laptop won't start up anywhere past the windows logo so I'm trying to backup my files in C:\Users\Rainz3d\* to an external hard-drive using a KNOPPPIX disc. I boot up KNOPPIX fine, and can get into C:\Users, but I can't open the Rainz3d directory. It keeps saying "permission denied". I tried right-clicking the folder and changing the permissions in properties, but it says "operation denied" and reverts. Is there a way around this? I'm using the most up-to-date KNOPPIX disc, but I've never used KNOPPIX before in my life. Any help would be greatly appreciated.