What to do?

[MagnusB]

What did you do before GDM failed? Have you changed the refresh rate? Should always be careful when doing that, as setting it to high could fry your panel.
Now, there is a easy fix to restore a broken xorg.conf, assuming you still have your livecd.
1. Boot into the liveCD.
2. Make sure the root filesystem is mounted, open nautilus/konqueror/thunar and double click on xxxGB disk or whatever.
3. Open a terminal window, and CD into your root disk:

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cd /media/disk

Make sure it is your root disk by:

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ls

This should return something like:

bin dev home lost+found

and so on.
4. Now just copy the working xorg.conf from your live session to your HDD install:

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sudo cp /etc/X11/xorg.conf /media/disk/etc/X11/xorg.conf

This is probably the easiest way to recover the xorg.conf if you didn't take a backup.

[MagnusB]

Are you using KDE or GNOME?
If you use GNOME, open mintMenu (in a live session) and select computer. On the navigation bar to the right double click on something like "50 GB disk" or a like.

[MagnusB]

Ok, then you might have to use mount in a terminal:

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fdisk -l

this should return something like:

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000195ad

Device Boot Start End Blocks Id System
/dev/sda1 1 249 2000061 82 Linux swap / Solaris
/dev/sda2 250 13083 103089105 83 Linux

In my case it is /dev/sda2, so I'll need to mount that:

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sudo mkdir /media/disk
sudo mount /dev/sda2 /media/disk

Then use my above mentioned codes to restore xorg.conf.

[newW2]

you need to have root privileges.

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sudo fdisk -l

[MagnusB]

To load ndiswrapper at boot:

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sudo gedit /etc/modules

and add ndiswrapper to the list. As for ndiswrapper -m, that only need to run once.

[Husse]

I just read the beginning of this topic and I don't intend to participate more in it but
there is mintUpdate for updates
specifically made to keep dangerous updates out of harms way! Please, please use it