I wanted to know what goes wrong when you restart the computer in the middle of installing Linux, because the system doesn't boot any more, I get a grub> prompt. I can't reinstall again.

What's the solution? I've found a grub manual but I'd rather know what the problem is before I read that.

Thanks in advance

IIRC, it's equivalent to rebooting Windows in the middle of an install; grub doesn't have enough information to establish a boot menu because the file system is corrupted.

I've had this happen before when my laptop's CD drive acted up. I believe I just had to boot to the CD and wipe the drive to install the OS; you should be able to use the install process to wipe the drive. If not, then use fdisk from an emergency prompt, if available. If you have a LiveCD it may let you correct the problem somewhat easily.

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Freeze in the middle of an install???
Dump it...

Windows or Linux you can usually locate format somewhere on an install set:
format hda(x)
...and start again.

You don't want the install program to continue to install around a screw up...
It will still be there waiting to pounce when you least expect.

These things happen a lot, the solution is to go for linux installation again, Windows partition is not affected anyway.