How to restore the mac

hi there,
i have a mac book pro which i bought in the middle of 2011, and my current mac sofetwear is "mac os x version 10.6.8",
i wanted to upgrade the sofewear to 10.8, which i just bought from app atore(australia) for $20.99, but when i installing the softwear at step "choose the disk for install", i found that i cannot choose any one of my disk, it says"No user GUID available"
just wanna ask can i just restore my mac and install the new version of 10.8?(i already copy all the important data to my hard drive cz when i use time machine to back up the mac,it also says that no disk is avaiable)
and if i need to restore the mac how can i do it?
and do i need to buy agian the 10.8 softwear from app store if i restore my mac?
looking forward to your reply
thank you very much:)
regards
angie

You have a older Mac that was upgraded to 10.6.8 without a GUID partition table it sounds like.
Anyway, take your machine to a local PC/Mac tech and have them reccomend a course of action, make backups of your data and do the upgrade, provided your machine is capable of it.
You need more RAM, at least 4GB or more and a 64 bit processor really for the latest operating system, and some Mac's 10.8 can't be installed on.
It's all rather complicated and best for you to have a professioanl do it and if the machine is earlier than Early 2011, you might want to consider sticking with 10.6.8, 2010 models are iffy and won't have all the hardare features with the new OS X version.
According to all the reports I've been scouring, it seems 2011 machines and later have little problems upgrading to 10.8, it's all the earlier ones that are having issues and if your out of AppleCare, if the firmware breaks the machine, it's a out of pocket expense for a new logicboard or your looking at a total loss.
I had OS X 10.7 brick a perfectly working older machine, you don't hear the people complaining too much about that because they can't.

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