[ubuntu] Weird Things

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http://ubuntuforums.org – lately my ubuntu 11.10 has benn acting weird, last week everything was fine, then i tried to install sims 3 (i bought the game) using playonlinux. since then my computer will not shut down unless i hold the power button, it basically just get stuck at the purple ubuntu screen, then i have to hold down the power button to shut it off completely, also i am downloading oblivion using transmission. and it will only download for like 10 mins then it does like as if my internet connection is not there anymore and i cannot do anything, like i cannot disconnect for my network, i cannot open settings.. (Hardware)