It's best to have double the amount of memory required by the OS.
You don't have enough memory to run any Mac OS at a reasonable performance.
Here are the requirement for Snow Leopard.
- Mac computer with an Intel processor
- 1GB of memory
- 5GB of available disk space
- DVD drive for installation
- Some features require a compatible Internet service provider; fees may apply.
Apple is still selling snow leopard for $20. This is a good deal in my view.
http://support.apple.com/kb/sp575
You have a two processor machine. You are not getting your value by having two little memory.
This maybe the memory you need. Verify by their model number lookup.
http://eshop.macsales.com/shop/memory/MacBook/DDR2/
I understand they ship international.
Check with curcial.
Robert