Ight....im having several on going issues with my PC right now that i need some help with....

1) I keep my task manager in my task manager so i can see the performance from time to time. Im noticing when i open lets say my computer it sky rockets to 100% then drops back to about 30%. It doesnt even have to be my computer....it can be anything...once i open it the system sky rockets then drops back down to normal...Im running a Dell Dimension 2400 with 2.2GHZ processor and 768MB ram. I dont have many applications running at the current time...Like right now i have Itunes, Gaim, and Firefox. In the task manager i have real VNC, ServU FTP server, Emule, and SAV. There should be no reason my PC is acting like that...I just formatted it 2 days ago.

2) For some reason i'll look at my task manager and see FireFox eating up close to 60k of Mem. Usage...is that normal for this app. It happens even when i have just one browser open.

3) When i be playing music and open a program or even just when i boot windows the sound some times sound like its stuttering or choppy and i cant for the life of me figure out why.

I think those are the three main problems im having now...any help is greatly appreciated