If i can not find the disk that came wit the computer can i still reset it?

Computer has been sitting around for a long time and has a lot of thing that i dont need any more and need it to be a lot faster then what it is and would like to restore like you do an iphone are an ipad. Can i still do that if i don't have the disk it came with?

Hello ut2729,
If you are running Lion or Mountain Lion, this can be achieved using the Recovery HD.
OS X Mountain Lion: Erase and reinstall OS X
http://support.apple.com/kb/PH11273
You can erase your Mac and then reinstall OS X using the built-in recovery disk. Before you erase and reinstall, back up your essential files. If you’re installing on a portable computer, make sure your power adapter is connected and plugged in.
Important: To reinstall OS X, you need to be connected to the Internet.
Choose Apple menu > Restart. Once your Mac restarts (and the gray screen appears), hold down the Command (⌘) and R keys.
If you’re not connected to the Internet, choose a network from the Wi-Fi menu (in the top-right corner of the screen).
Select Disk Utility, and then click Continue.
Select your startup disk from the list on the left, and then click the Erase tab.
From the Format pop-up menu, choose Mac OS Extended (Journaled), enter a name for your disk, and then click Erase.
After the disk is erased, choose Disk Utility > Quit Disk Utility.
Select Reinstall OS X, click Continue, and then follow the instructions.For more information about reinstalling OS X, see this help topic:Reinstall OS X
You can also create an external recovery disk. For more information, see this Apple Support article:
About Recovery Disk Assistant
Cheers,
Allen

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