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Problems booting into Windows 8 after installing Ubuntu 13.04

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http://askubuntu.com – I just attempted to set up my Lenovo Thinkpad Twist to dual boot. It had Windows 8.1 pre-installed. I burned Ubuntu 13.04 to a USB and booted from that. I partitioned the drives allocating 50 GB for the Ubuntu partition. Ubuntu itself works fine, however when I try to boot back into windows I get an "error: can't find command 'drivemap'" and "error: invalid EFI file path". It looks like the problem is that the partition created 4 separate file systems: Lenovo_recovery, 367MB Volume, Windows8_OS, and WINRE_DRV. There is a boot folder under the Windows8_OS file system, but I think that it is not (HowTos)