My computer has been freezing and crashing a lot recently and I think one of my roommates has something to do with it. I will not get into the specifics but he is an IT programming student and lately there has been bad blood, he is also very passive aggressive so this is something I wouldn't put past him. The router and modem are connected in his room, though I'm not sure if this would aid him in any way. Also my wireless internet connection has been slow at best lately and I've been wondering if there is a way to limit bandwidth to certain computers on the network. I have been looking around on the internet and it seems that something like this wouldn't be any problem to someone with a background in program writing, etc. I guess what I'm asking is is there a way to determine if someone is maliciously attacking my computer? And if so, what can I do to reverse some of the things that have been happening?