quite easy. read the msfn guide about $OEM$ folders so the LS dir gets copied to the root of C:\, and then add a line in your reg hacks file to change HKLM\software\M$\windowsnt\current\winlogon shell=c:\litestep\litestep.exe

and you should be set.

oh, and it doesnt have to be to the root of c:\, but make sure your line for shell= points to wherever you put LS