I'm fairly sure you can't disable it. BSODs are kernel traps and they mean something bad happened and windows has halted everything to prevent it from possinly getting worse. If you could disable them and a condition was met that would normally get a BSOD chances are good your PC would be useless until you reboot it anyway so it's not a bad thing to have on, at least you get an indication of what went wrong and can try to fix it.