If someone torrents a OS X upgrade on your computer how can you restore it without the startup disk

I recently let my friend use my computer for a few days with the promise that it would run better. When i got it back i found out he torrented Mac OS X 10.7. i have let it sit on my computer for a while but it has caused problems with downloading apps. I would like to know how to downgrade back to the compter was when i orginally bought it. I do not have a startup disk because i bought it from a used mac seller online. also i would like to keep my files, music, games, ETC.

That was an incredibly bad thing your friend did to your computer. A torrent of just about any software you download for the Mac will have malware in it. So that gets installed along with the software you think you're getting for "free".
I wouldn't use that computer for anything where you may type in a password, checking or credit card numbers, or any other type of sensitive data until you've had the chance to backup your important files.
Once you have a way to do so, erase the drive and reinstall the OS, and then reinstall only your legally acquired software.

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