system compromised

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https://bbs.archlinux.org – today my wireless card droped unexpectely so I checked the auth log and see a bunch of access at times I was asleep, i left my house and came back just now and wifi back up and I see a twm something something in the bottom middle of the screen so I check the auth logs again and see again more acess at times I wasn't there. I'll post any data needed if you can help. I just started using iptables with the conf from the wiki if that makes a differnece. I'm just really upset because I feel I am defenceless as I will never have the potinetial that some of you gurus do, linux programm (HowTos)