Will reinstalling lion erase my crashed hard drive

Hi, I have a question someone can help me with.  My Macbook Pro 2011 model 13 inch crashed.  .  Anyway I found out there is a recovery partion in Lion.  If i reinstall LION operating system on my crashed MacBook Pro will I loose my information on my hard drive.  I dont care about music and such just pictures.  I have over 50k pictures saved on it.  I was in the process of backing them up and that is where the crash happened.  I was building up all my pictures in Iphoto albums trying to make it look nice and such and when I was backing up it Crashed.  I just want to confirm if I reinstall Lion Operating system it will not erase my hard drive.  Please help, any help will be greatly appreciated.
I dont want to loose my pictures and I know i will never say anything on a hard drive again
I know the information is still there.  I did Target Disk mode started transfering but it said it would take 50 hours and my friends Mac started to get too hot.
Thank you again

Did they give you your system back, or a completely different one? If you were previously using Mountain Lion then you had a system with a Core 2 Duo processor or later model. If your current system does not have this processor then they swapped the entire systems out on you.
Go to the Apple menu and choose "About this Mac," and then post back here with the exact model name of the processor that is listed there.

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