My computer's slow, games and videos are lagging please help!

Aug 1, 2013
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10,510
So here's my problem. When I'm playing league of legends or when Im watching videos on youtube it and sometimes it lags a bit(mostly the audio when I'm playing league of legends) And when I'm downloading something or when I'm copying files an error occurs saying that I don't have enough disk space and sometimes it says that I don't have enough memory. Oh and my lan card just dies and I have to restart my computer to make it working again. Everything was ok 2 weeks ago And nothing is overheating! I don't know if my mobo or my PSU is failing please help!

IDK why it was posted 2 times but I remember clicking the post button only once!

here are my specs :
mobo : ASrock H61M-VS
RAM : Kingston 4GB PC3-10600 DDR3 RAM
Graphic Card : ASUS GTX550 Ti
PSU : Cooler Master GX550W
CPU : i5-2500 3.30GHz
HDD : 1xWD Cavier Blue1TB 2xSeagate Barracude 1TB
OS : windows 7 ultimate 32-bit