My MacBook Pro is running on an older version of Mac OS X but will not allow me to upgrade to a newer version

My MacBook Pro is running on a 10.5.8 operating system but has not allowed me to upgrade. It has been fine for the past few years but is now getting to the point where programs are not functioning properly. What operating system should I be trying to upgrade to and what should I do in order for the upgrade to work? I have tried upgrading to Mac OS X Snow Leopard but it says that I need 10.6 in order to upgrade to Snow Leopard. The only upgrade that has begun to work has been a 10.5.6 which is a less updated version of the operating system that I'm already using. Will downloading 10.5.6 allow me to upgrade to a better version? Any help is appreciated! Thanks!

Choose About this Mac from the Apple menu and check the processor.
If it's a Core Duo Mac, click here, install the DVD, and run Software Update.
If it's a Core 2 Duo or better Mac, upgrade it as if it was a Core Duo Mac, and if desired, open the Mac App Store, and try downloading 10.9. If you get told it's incompatible, go to the online Apple Store and order a download code for Lion 10.7.
Mac OS X 10.7 and newer don't support PowerPC software such as Microsoft Office 2004. If you upgrade the OS, back up the computer first.
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