[lubuntu] Unable to Login with GUI. Coloured lines\bars

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http://ubuntuforums.org – I am new to Linux i successfully installed lubuntu 12.10 alternate version "lubuntu-12.10-alternate-i386". I checked the iso file using "winmid5Sum" and it was proper. I burned it and checked error for disk, even that was proper. After installation , from grub i went to ubuntu, then i got this weird screen full of colored bars. It didn't make any sense. I tried ctrl+alt+f1 and logged onto it, then ctrl+alt+f7. still the same screen. i am using System Model: HV84510A BIOS: Default System BIOS Processor: Intel(R) Pentium(R) 4 CPU 1.60GHz (Hardware)