How to stop the installer and make a USB version of OSX Mountain Lion

Hi - I have had some serious problems with Mountain Lion and support from Apple has demanded reinstallation of OSX. With my rather slow BT Connect broadband sometimes the download takes 6-7 hours!!! Sometimes it stop as I understand BT Connect limits downloads. While I find a new ISP, can anyone advise me how to make an installable version of Mountain Lion from a USB stick . I have tried downloading the installer but it then immediately begins to install ISX ML and the disappears from my Downloads Directory. After 6 hours wait I am back to square one.
All and any help most gratefully received. My machine is a 13" 2012 Macbook Air with 128GB SSD and 4GB RAM.

It's easy. First, you have to download OS X Mountain Lion, so open the App Store > Purchases, and download OS X Mountain Lion. Then, when the download finishes, the installer will appear, so close it and it will stay in Applications folder. After reinstalling OS X, OS X deletes the installer, so it's important to do that.
Finally, you can use an application like Lion Diskmaker to create a Mountain Lion USB drive > http://liondiskmaker.com After creating the Mountain Lion USB drive, to start from the USB drive, hold the Option (Alt) key while your computer is starting and select your USB drive

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