No operating system is more backward compatible than Linux
. There should be no reason an i386 version will not run - probably noticeably faster than the other system - on your computer. First step if your computer will accept more ram is to upgrade to the maximum possible. You may have to do some legwork and use your favorite search engine
to locate compatible ram for your system. If you have never added ram yourself before fear not. It is very simple to do - so save your $ and do it yourself.
Your Linux installation
will be straight forward since you will not be using media programs that require a bit more research
and work in the installation
Any Linux flavor will do. Fedora, Ubuntu and Debian are a few of the more popular packagers available for free.
Lots of help available if you need it. Here and by simply using a search engine
with relevant key words.
You didn't mention hard drive capacity. May need a bigger drive.