just installed the PCSX2 - how do I control it???

OK, question might sound stupid, but I am serious:

I have just succesfully installed PCSX2, got it to run Gran Turismo 4 from the first try (which is amazing!), BUT...

... I only got to the options screen and can't press a single button!

Yes, I am currently using my standard PC keyboard and mouse, but I dont really want to go out and spend money on controller before I have made sure that game is working as it should. So my question has 2 parts:

1. is it possible to set it to be controlled by keyboard just for trial and how to do it?

2. Can I expect GT4 to run on my quite old PC setup - Pentium4 3.00GHz and NVIDIA GeForce 7600 GT 2 GB of RAM?

p.s. I am only planning to play GT4 with a steering wheel setup, no other games or other controllers interest me.

I would really appreciate some advice here.

Well start here.

I'm pretty sure a key board will work you just need to configure it in lillypad or some other plug-in.

Well, now I have bouth the pad but I still cant get it working. That link was useful tosort out initial setup bugs for video, but there is nothing about controls...

I am missing something very simple and basic...

ah, yeah well that is the easy part LOL. Tell me the plug in your using and I'll help you out.

I think this vid tells it all.
http://www.youtube.com/watch?v=__FULtkR3N0