Just joined to this site so don't know where to post my problem?( if this is wrong place plz. consider) I am getting blue screen error. each time different errors like IRQL_NOT_LESS... DRIVER_IRQL_NOT_LESS... BUG_CODE_USB_DRIVER some time error like driver ATI radian family stop responding and recover. some time error in file atikmdag.sys usbotici.sys i checked driver my ATI HDMI Audio,VIA high definition,realteck PC(n/w adapter) is out of date. i checked RAM with memtest s/w its working properly for three pass. i have only one peace of 2GB DDR3 RAM. its working in only one slot out of 4. don't know weather slot is bad? sometime after pressing power button nothing happen, so PC not get the power supply. then after moving the CPU it automatically start working. my PC config: AMD phenom X4 925, 2gb RAM,win7 64bit & XP SP2 antivirus avira. i am also not getting the link to update the driver. i would be very happy if some one help me.