Asus 1015cx netbook won't boot in Ubuntu 12.04 after installing additional drivers

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http://askubuntu.com – I have an Asus 1015cx netbook with atom dual core, 1gb ram. I installed Ubuntu 12.04 with wubi inside windows 7 and evrythng was ok..but when i installed additional drivers of broadcom and cedar trail, the netbook does not boots after restart. There occurs a blank screen and curosr keeps blinking. The same problem hapened with Xubuntu 12.04. Please suggest. Thanks. (HowTos)