You should try leaving the console flat while playing, if you haven't done that already. Keep it in a spot where it will receive no disturbance from outside sources. Another cause could be due to over usage. Limit the amount of hours spent playing.
With those computer specs you are going to be limmitted to older or less resource consuming games. You might try turning all the video settings to minimum in the game options, and to turn off everything you dont need in windows itself , while you are playing.
But the bad news is you dont have cpu, video, or memory enough to play most of todays highend 3d games..