Reinstalling OSX mountain lion

My computer is acting strangely and stops all the time to work - I can hear lots of little hard drive sounds and it is very slow until it is done (usually about 10 minutes), and my Adobe CS products are crashing and creating corrupt files that keep stopping.
I tried to reinstall the system today - I couldn't use the installer that came with the computer because I have installed Mountain Lion since.
I tried installing from the 'Install OSX Mountain Lion.app" file, and it went through the motions and said it was installing, but now it appears to be exactly the same - normally I would get the welcome screen and have to configure things. It did not give me an option to do a clean install.
How can I do a new installation to get rid of the existing problems on this computer? It is only a year old (iMac i7) and has 8 gb of RAM so it shouldn't be so slow. My laptop is the same and is much faster.
thanks for any help.

I couldn't use the installer that came with the computer because I have installed Mountain Lion since.
FWIW (and future reference), you should be able to install the original system (if it was Lion):
If you use internet recovery (Command + Option + R), then the original OS version will be reinstalled after you wipe the drive.
If you use recovery (Command + R) the current OS version will be reinstalled.
If the originally installed OS version same with install disks (Snow Leopard or earlier), you can boot from that disk; however, in order to revert, you will need to wipe the drive first.
And, since you want to get rid of "existing problems", starting over with a clean install is best. You do not know if your problems are only caused by the OS or possibly some incompatibility of third party software which would not be fixed if you simply reinstall the OS over the top of what you have.

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gwdev=en0 # This is my WiFi connection (has Internet connection)
targetdev=en1 # This is the USB to Ethernet adapter (to give Internet connection)
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/sbin/route add default -interface bridge0 -ifscope bridge0 -cloning
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How to reinstall OSX Mountain Lion?

I have a 2010 iMac and currently have OSX Mountain Lion 10.8.5 installed.
I would like to reformat and erase all information from my computer but don't want to go thru starting with Snow Leopard again with the original disks that came with the iMac.
I purchased Mountain Lion thru the APP store so do not have a disk for it.
Is there an easy way for me to reinstall a fresh copy of Mountain Lion and erase all content on computer?
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Hold down Command-R during startup,
From there use disk utility to erase the drive and reinstall OS X.

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Mountain Lion has become unstable on my Solid State Harddrive (Corsair CSSD F120GB) and I'm plannng to erase and start from scratch.   Had problem before with doing this and then being unable to access my Time Machine backup.    Permissions issue.   I'm aware that I don't need to erase but after two years, I'd like to have a clean slate and try something new.   Just don't want to lose access to my docs and pictures.
Plan right now is to boot into recovery mode (option key during boot), go into Disk Util and choose erase. Then back into Reinstal OSX.   Same hard drive but fresh copy of OSX.   Will I be able to access backup in Time Machine?

No reason why not if you use the same username and password for the admin account.
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
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3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
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Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
However, Time Machine will consider this a new device so it will want to make a new backup. Please visit Pondini's Time Machine FAQ for help getting Time Machine to continue using the old backup.

Mac Reinstaller only has option to reinstall OSX mountain lion, but...

My harddrive crashed, trying to use reinstaller on wiped hard drive, but Mac reinstaller only has option to install Mountain Lion 10.8, but i was using Lion 10.7.4. How can i purchase mountain lion or just restore the version of osx i have paid for>

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I have a MacBook Air and was suggested to delete everything on my HD before potentiallly selling my MacBook. So I followed all the instructions, disk utility, erase hard drive, go back and reinstall Mountain Lion. Anyways everything is going smoothly, but my installation time says up to 500 hours for it yo download !!! Is that crazy? Some malfunction? Or just my internet connection???
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It could be a server-side slowdown of sorts, but likely is because of your connection. Are you in a relatively remote area? Most broadband connections should take a few hours or less to download the installers, which are around 4GB in size.

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How do i reinstall the OSX mountain lion on my mac bought at different app store when living in that country?

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It should not make any difference where you are located. Have you examined these support articles:
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Ciao.

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https://discussions.apple.com/docs/DOC-3761

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Hi All,
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Cheers

If your system's not compatible with 10.8 and has at least a Core 2 Duo(not Core Duo) CPU, phone the online Apple Store and order a download code for 10.7.
(73799)

Reinstalling OSX mountain lion

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