Ubuntu 13.4 starting problem

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http://askubuntu.com – I have installed Ubuntu 13.4 on my Lenovo by using Wubi installer,at the boot menu when i select the Ubuntu option the screen goes black ,but when i select the advace Ubuntu option in recovery mode it works,so i want to know what is the possible solution to get Ubuntu work from the normal mode rather than the recovery mode. My laptop's configuration are Intel i5 (3rd gen) 8gb ram 1Tb Hard Disk Nvidia GEFORCE 720M(2gb). Note:-Currently i am posting this question from the newly installed Ubuntu. (HowTos)