[wubi] Xen installation attempt on flash drive; Windows on internal hard disk wont boot

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http://ubuntuforums.org – I am posting my question here since I have a wubi-installation of Ubuntu. My system is setup like this: 80 GB hard disk with Windows XP on C:/, with Ubuntu 10.04 as a WUBI install, 2 other partitions just for data.(So very less data on C:/). Everything was perfect for more than a year. My work required me to install Xen ( http://xen.org/), so I wanted to try it out on a 16 GB USB flash drive; did not want to disturb my existing configuration. So I installed Fedora16 (has grub2) on my USB drive, and followed instructions from http://wiki.xen.org/wiki/Fedora_16_Dom0 and installed Xe (Hardware)