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Yesterday i installed Ubuntu 12 on my USB external HDD and it works great (although very slow start-up) but when i disconnect the the drive it wont allow me to load windows 7 on my laptop and gives me a GRUB load error. now i am very new to ubuntu and this is exactly what i was trying to avoid. if i leave the external plugged in it give me a boot menu and i can choose which os to load but i don't always want to have the external connected. any help in resolving this issue would be great. Thanks

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