for some reason, my computer starts up using 50% of the available RAM. I have uninstalled all programs I don't use, checked the items that start with my computer (not just the startup folder - everything) and I have even tried RAM optimizers (which I only just recently was able to get rid of entirely). I cannot figure out why my RAM usage is so high. its really annoying me, because I get messages about programs using too much RAM (firefox? wtf how much ram does firefox use!) and I've even had my computer freeze because it ran out of RAM. any ideas?