I bought a used iMac and I want to format and re-install the operating system however it didn't come w/operating system software.

I bought an iMac from a client and I'm concerned that the software that is on the system is not secure. I would like to remove everything and start with factory default programs and settings. The system is about 3-4 years old and there are no original operating system software discs.
How to I re-format the hard drive, and do I need to purchase an operating system for it?
Thanks.

Your best bet is to call AppleCare and order a set of original OS X Install Discs, you will need a credit card and the serial number of the computer. If you don't know what version of OS X was on the system when it originally was purchased that is the best thing to do, otherwise you're shooting in the dark. The cost is going to be in the $30-40 range I believe.
You didn't complete your profile so we have no idea where you are located or anything about your system. You can use the following link to locate AppleCare's phone number in your country.
http://support.apple.com/kb/HE57

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