On Windows 8, you may encounter the following error when you try to extract one or more files from a ZIP file:
An unexpected error is keeping you from copying the file. If you continue to receive this error, you can use the error code to search for help with this problem
Error 0x80004005: Unspecified error
Error 0x80004005 stands for “Access Denied”. In most cases this is the result of a password protected ZIP file. Windows 8 can’t handle password protected ZIP files, neither does it prompt you that the ZIP is password protected.
To workaround, download a good ZIP file manager, like 7-ZIP. 7-ZIP will always prompt you to enter the password if needed.