Mac 0S X version 10.5.8 upgrade to next version?

Hello,
I need some help & adivce on what I should do to for my Macbook. Lately its been going really slow and won't create new tabs unless I quit Safari completly or just restart the computer altogether.
Also, I usually don't buy apps on my iTunes on Mac but use my phone. My itunes won't let me buy anything just only to view the app.
I don't know what to do exactly,should I upgrade and use Snow Leopard or OS Maverick (i think that's what its called) or what?
Please help!!!!!!!!!!!!!!

Upgrade to Snow Leopard:
The OS 10.6 Snow Leopard install DVD is available for $19.99 from the Apple Store:
http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard
and in the UK:
http://store.apple.com/uk/product/MC573/mac-os-x-106-snow-leopard
When you have installed it, run Software Update to download and install the latest updates for Snow Leopard to bring it up to 10.6.8, or download the combo update from here:
http://support.apple.com/kb/DL1399
Check via Software Update whether any further updates are required, particularly to iTunes.

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