Upgrading my PC...?

This is my PC.

So today I received a 3.0 ghz processor and a 512 MB RAM for free.

Now I want to know if my PC is compatible.
The processor was Intel Pentium 4 and the RAM was 512mb 1rx8 pc2-4200u-444-12- D3. (Not very tech savvy so ask if this isn't the info you need, I was just reading the labels on the 2 pieces.)

I want to know if I can upgrade and if so could someone be so kind as to tell me how to do so?

I've never had to upgrade my PC, but I've hard countless people say it's easy, so I'm sure it shouldn't be much trouble giving me a brief summary of the process involved?

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