Basic RAM question: When I start my computer up, my Free RAM is very large (obviously, i haven't used any apps yet). As I use the computer, the RAM becomes spread out over various applications and the computer gets a little slower. Is there a way to "reset" the RAM, or clear it for a certain application, without resetting the computer? For instance, if i use a memory-hog like Excel for 2 seconds, my free RAM will be lower until i reboot. This is because some RAM is being dedicated to Excel, righT? How can i "free" that RAM?! Thanks!