adeydas's Journal: LSA shell problem with Windows XP

I am having a strange problem with my Windows XP installation. Sometimes for no good reason it show a message saying that an error has been caused in the LSA shell. After a minute or so, its provides another message to close all running applications because it is going to reboot in a minute. At this time, the Shut Down button dosen't work. The error generated is in the file lsas.exe. Wonder what this is all about?!