Lsass.exe error when computer is locked



Im running a Dell GX745 with xpsp2, Im getting a lsass.exe error over
night when I come back in the next morning. I lock my computer every
night but I have the error ever other morning.

Lsass.exe
0x1e93b81c
0x6d6a2f2f

Any Thoughts?

Thanks

.