How to reinstall Mountain Lion after Mavericks OS has been installed without using the time machine?

Hi, I upgraded to Maverics a few weeks ago, and since than my computer has been very slow. It NEVER happened before. Now, I want to go back to Mountain Lion, but I didn't back up my computer with the time machine. I'd appreciate if anyone could tell me how to reinstall Mountain Lion again over Maverics? Thanks a lot for your help!

You will need either a bootable flash drive with Mountain Lion to install, if you have one, or reinstall Snow Leopard if your computer can boot Snow Leopard. Or you can use Internet Recovery to reinstall the original version of OS X that came with the computer. In any event you will have to repartition and reformat the drive.
Install Mavericks, Lion/Mountain Lion on a New HDD/SDD
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 Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your external hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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