PC Slows When Using Anything That Uses A Lot Of Bandwidth?

the screen will get very dim at the windows icon where it pulses against a black background..could this indicate I need a bigger power supply? (I read that somewhere recently, hehe)When I use my iphone, xbox, or any torrent program, my computer slows down and my mouse stutters for lack of a better term. It waits a few seconds before jumping to where ever it was that I moved my mouse. This is stopping me from using the computer when I watch netflix or anything else where data is being transfered. I'm not sure what Hijack This found, but here's the log it provides and if there's anything else I need to post, just let me know where to go and I'll post it here ASAP.