Access denied for another OS files

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http://superuser.com – I have dual boot windows 7 + 8. I really need to copy some data from users folder, etc... But when I open win 8 users folder in win 7 and I try to copy something, I get Access denied error. I'm accessing as admin. Please help me. I saw that Access error like thousands of times today :( I already tried to change rights for that folder, got Access denied while changing... (HowTos)