Audio Production Software

I would like to do video production with decent audio on computer.
What software and hardware do your use, or recommend, that is not too expensive, but will still deliver quality results.
Also, I want the installation and operating processes, to be user friendly, yet be capable of more complicated editing as my experience improves.
I have many ideas, which I think will appeal, to an audience on youtube.
Thanks, but I actually have a Canon GL1 (I know it’s a little bit older, but still works great) and my intention, is to write and direct my own short videos, add audio tracks, and sound, and edit this all on my computer.
Now the computer is also a little but older, but has this capacity:
180GB HD
512MB Ram.
And sufficient speed, that when I turn off all the background programs, it should be able to edit movies with sound.

would say Sony Vegas pro is a way to go.. Really simple program and easy to learn. You can get from Aries-Films file section. Just google for Aries-Films. Thats it.