is it possible to install just GRUB in a PC with no linux?
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not trivially as grub chains on to the stage2 image which is in the /boot partition of one of the Linux systems on the machine. You can run grub-install from an installer, however that will only get you a very minimal stage1 (1.5?) shell which I don't think give you any of the good stuff you are after.
Simplest solution is SuperGrubDisk as suggested above. You will obviously need a Linux CD or installation to get the Grub files if you try one of the two methods above. Since windows isn't booting, its boot files or something else may be corrupted and there is still no guarantee any of this will work.
Thanks for all the fast and excellent replies.
For any of the suggestions, I'll need some help.
1) About creating a minimal partition, how can I resize the existing partitions to open a space for the new linux partition? The laptop has 3 partitions: first the windows system partition (~100 MB), second the windows partition, and a data partition in the end. I'm thinking about resizing the last partition, but I just know how to do it graphically.
2) How does the super grub disk works? I burn it in a CD, boot it, and then it installs itself in my MBR? Is that it?
There are different methods and files on different windows versions. You don't indicate which windows version you have. I'd do a little more investigating before trying to resize. It sounds like you have an OEM installation with a boot partition, system partition and recovery partition but there is no way for us to know that?? The last partition is probably the recovery partition. Do you have a recovery disk? Which windows version do you have?
The supergrubdisk boots the system from CD, it doesn't install to the mbr, AFAIK.