hanging

i have p42.8ghz,gigabyte ga8s650gxm-p rev 1-x m/b,seagate 160gb hard disk,lg dvd rw ,256 ram,

my problem ia my sys is stable (i.e even mouse pointer also does not move)at the time of windows logo sccroling or at WELCOME screen. in case if rarely opens some time after ,while adding song s to the playlist of wmplayer .it again hangs ,the mouse pointer also does not move,then when i restarted the sys the same repeats,most times after win logo & before welcome screen a blue screen appears with unmoving pointer.
so please help me

Opinion add ram 256k when trying to run today's stuff that is asking a lot! 1Gig will make quite a difference 2 will put a smile on your face, ram is cheap these days you will feel like you bought a new computer.