I want to reload the operating system

Hi,
My Macbook Pro has been running slow and the advice received at the Southampton Apple Store is to wipe the drive and reload the operating system.    I have just completed a full back up to my Airport Extreme/Timeport.  Thing is, I cannot remember what I am supposed to do next.  Please could anyone help me.
I am running Lion and want to upgrade to Mountain Lion,  but was advised to do the wipe first.
Many thanks
Steve

deeeeps wrote:
Airport Extreme/Timeport.
Not really the best choice, use a external storage drive and the emergency quick copy method for your user files. (not TimeMachine)
Make sure you take note of all your programs, password and export your browser bookmarks.
You may want to clone your present boot drive in it's entirety to another external drive first, just in case you need to boot from it to grab somethign you missed or compare.
Most commonly used backup methods
Then follow this proceedure for Security Zero Erase and install of 10.7 on the Macintosh HD partition and reinstall OS X, programs and return files in that order.
How to reinstall just OS X or erase/install OS X
Reducing bad sectors effect on hard drives
Why is my computer slow?
Once you machine is all cleaned up and set up the way you want, then make a new bootable clone for problems like this and also if your boot drive dies, you can boot rom the clone to get online etc.

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