Mountain Lion Update for my macbook pro FAILED!!!!

Hi everyone,
I just updated my macbook pro yesterday. However, when time remained 19 minutes, the updated failed and a message popped out: 'Install Failed: OS X could not be installed on your computer.' It also asked me to restart and try installing again.
However, after I restarted, it was still unsuccessful and this same message popped out. Whenever I turn on my macbook pro, it just stays on the the update install process and I can't even quit it. I tried to choose Startup Disk, however, no system shown and I couldn't select the system I want to use to start up my computer. I just don't know what to do but I really need to use my macbook pro as soon as possible. I have to use the files on it to do something really urgent and important. If someone has encountered this problem and found out the solution, please tell and help me! I really need your kind help!!!! Thanks so much!!!!

System requirements here:
http://support.apple.com/kb/HT5444?viewlocale=en_US&locale=en_US
If you have supported Macs, just go to the Mac App store and buy it. You can install it on up to 5 Macs on one licence

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