Can't use Nvidia drivers in Dell Inspiron n5110

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http://askubuntu.com – I have a Nvidia gt525m card installed in my Dell Inspiron n5110 laptop. After installing recommended drivers of my graphic card in Ubuntu 11.10 it happens nothing but that disables Unity3D effects and I started to hear the loud noise from the cooling system. To solve the problem I used sudo nvidia-xconfig, after rebooting my computer shows some text lines instead of showing GUI. What should I do to solve this problem? (HowTos)