Ubuntu 12.10 won't boot after Nvidia drivers upgrade

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http://askubuntu.com – I have installed newest Nvidia drivers (from their site with the .run file) on my laptop with Nvidia Geroce 420M. After some time I decided to try out open source drivers there I went to System Settings -> Software Sources -> Additional drivers and clicked Open source drivers and applied the changes. After a reboot I have had no Unity panel shown when I logged into the system. So I googled a little and then removed all nvidia-* packages (except nvidia-common) and installed nvidia-current-updates, rebooted and ... boom system won't load. So I booted now from the livecd and got some (HowTos)