Upgrades

I think my computer is in need of some upgrading, Especially memory. I have 512MB ram and 660MB memory usage.

Mozilla is somewhat to blame for it, It reaches 190MB of virtual memory, which i have no idea why.
Plus, my system hangs everytime it needs to play a .wav file.
I’ve looked through dozen of possible solutions and explanations including changing my sound card, with no success.

it’s frustrating.
What’s more frustrating is that without a job right now, i can’t efford any upgrades.