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my OS is Windows 7 and I want install Debian, I have download Debian .iso, how could I install it from disk, I try to use grub4dos, I extract grldr to my C:\ ,but there is already a file called grldr, can grub4dos's grldr file replace Windows 7 's grldr file?

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Do you want to dual boot or do you want Debain to be the only OS on the system? – ubiquibacon Jan 26 '11 at 2:54
i want dual boot – user41775 Jan 26 '11 at 6:22

To install with just the ISO, take a look at UNetbootin. It allows you to create a bootable USB drive for installation, or perform a "frugal" install directly from the ISO to a partition.

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i want use "frugal" install ,but debian 's website say The installer cannot boot from files on an NTFS file system. my c:\ is ntfs ,and UNetbootin extract the iso to c:\ – user41775 Jan 26 '11 at 6:24
@user41775 You can use a partition tool to prepare a separate (even FAT32) partition and move the files there. None are over 4GiB and the installer should let you format a partition in ext3/4. – John T Jan 26 '11 at 22:56

You do not specify exactly what you want to do. Assuming you want to dual boot simply follow the instructions here. Best dual boot guide I have ever seen. The link I provided is for Linux + Vista (Vista Installed First) but the steps are the same with Windows 7.

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i open this link ,but got this message "You are not authorized to view this page" – user41775 Jan 26 '11 at 6:31
@user41775 I don't know why you got that message, the link works fine. Is your computer running some kind of censoring software like WebSense? – ubiquibacon Jan 28 '11 at 18:59

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