My wifes computer has ran into an issue. When she tries to boot up it goes through the post screen and shows the XP splash screen then pops. Hello everyone, I get this n7bld8t379.cf system error when i attempt to start up my computer. I am Running windows XP. how is this problem fixable if you. The n7bld8t379.cf System Error is a problem that may affect a computer system running Windows XP. Lsass (Local Security Authentication Subsystem Service).