My eldest brother has recently taken to sneaking on my computer while I'm at school to download music and mess with his iPod and myspace. He's been banned off doing that on the family computer after it became rife with Viruses (virii?) after he just ran around the internet downloading music and God knows what else. It annoys me, because I payed for my computer with my own money, I look after it, its the most exspensive thing I own with a lot of important and private data. I know asking or telling him wont make any difference, so I'm looking in general for some detterent or some form of protection. I protect my computer with a windows password, but I dont use it after a screensaver, and it isnt asked for after I hibernate (which I do a lot). Any good brother scaring utilities out there?