Reinstalling Mountain Lion from recovery partition

Hi,
I am trying to reinstall the Mountain Lion OS from my recovery partition. I have already erased my drive and attempted to reinstall like I have always done. This time though it is asking for an apple id that was used to purchase lion. However I went from snow leapord to Mountain Lion, and am trying to reinstall my mountain lion.
I have done this before countless times and it has always worked, but now its not. I can not make a bootable flash drive to use as I already erased my hard drive and this is the only mac I have.
Any help would be appreciated.
Thank you,
Jeff

These are the instructions:
http://support.apple.com/kb/PH11273
Can you start up your MBP holding down the OPTION key ands access the Recovery partition?
What model MBP do you have?  Did it come with installation disks?  You may have to use those first before you can install Mt. Lion.
Ciao.

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