I quote myself (yeah, i'm a weird guy)
For those who got the 32 bits edition, and are installing it using a USB (unetbootin): a found a solution:
First you gotta know what unti is your USB, in my case is /dev/sdb
Now, boot the live USB, get down until you're in "compatibilty mode", then press tab for editing. After "xforcevesa" put "nomodeset" and enter.
Just wait, and you''ll see the live USB begin with a 800*600 resolution
Now install LMDE (the steps are obvious, i won't say them), and wait until it's complete.
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If you got stucked in "Configuring bootloader" for a big while, quit the installation and reboot. Then use the live USB . . . again (yeah, i know it's so hard . . .)
Now, get down until you're in "compatibilty mode", then press tab for editing. After "xforcevesa" put "nomodeset", and where it says "root = /dev/ram", replaces ram for the unit of your usb, in this case sdb and enter.
Now, you got LMDE installed but grub is screwed, let's get going . . .
First, you gotta know what's the partition where you installed LMDE, open a root terminal a type:
"mount /dev/sda2 /mnt" (sda2 is in this case the partition where you installed LMDE)
"mount --bind /dev /mnt/dev"
"mount --bind /proc /mnt/proc"
then . . .
"chroot /mnt"
"grub-install --recheck /dev/sda" (here it's sda because got to be installed in all the Hard Drive)
Then, reboot WITHOUT the live USB, and enter in LMDE, just login normal, now you got the SO normally installed.
Open the root terminal and type:
"update-grub2" and wait until it's complete.
If that command didn't work, type this:
"aptitude install grub2" and follw the steps.
NOW you got LMDE 32 bits Installed successfuly.
Oh, i forgot to say something: I got a Nvidia VGA, for ATI, i think instead "nomodeset" it's "radeon.modeset=0"
I hope it helps you.