The family computer. Full of viruses, spyware, adware and more. I don't know how they even manage to get a virus! Every week i've got to clean it out and this time it needs a format all 'cause my brother doesn't know the difference between surfing the internet and looking for pornographic material. My parents run their businesses using the internet and now they can't even get on it 'cause of my brother and he blatantly denies the whole lot.
I bet i'm not the only one to go through this though.
Fortunately i have my own systems but all being on the same network just really annoys me.