I just upgrade my Windows XP to Vista last week, and then i see that my CPU is always around 49%. It scares me, cuz my the desktop wasn't that high while I was using XP. Now I am really worried, but I am also very confused. At the time I upgrade my Windows, I also bought a new Video card, the geforce GTS 8800. So now I don't know is the high cpu usage is due to the upgrade of my Windows OS or the change of my video card. Then after i did the System Diagnostics test, and this is what I got. It says I have 2 processors and 4 network card, that is why it cuz 157448 interupts per sec. But what cuz this is still unforseen to me. Please, experts, friends, anyone, help me!!!