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I have to two operating systems in my computer. Ubuntu in D drive and windows 7 in C drive. Now I replaced window 7 with window 8 but I can't load both the windows simultaneously.. how I can resolve this problem??

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As it stands, your question is ambiguous. Is the problem that you cannot load both Windows systems, or that you cannot load both Windows 8 and Ubuntu? Either way, what happens when you try? – Eliah Kagan Jan 5 '13 at 6:21

As I understand after the windows 8 installation, now you cant boot ubuntu because the grub menu disappeared. All you need to do is re-install the grub. you can do it by creating a bootable USB using wubi. There are lots of tutorials in the web, If you want more assistance please ask below.

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