Instead of rolling back your system, next time use a boot disk and go in your system.ini and you should see the below line under [boot]:

[boot]
oemfonts.fon=vgaoem.fon
system.drv=system.drv
drivers=mmsystem.dll power.drv
user.exe=user.exe
gdi.exe=gdi.exe
sound.drv=mmsound.drv
dibeng.drv=dibeng.dll
comm.drv=comm.drv
mouse.drv=lmouse.drv
keyboard.drv=keyboard.drv
*DisplayFallback=0
fonts.fon=vgasys.fon
fixedfon.fon=vgafix.fon
386Grabber=vgafull.3gr
display.drv=pnpdrvr.drv
shell=C:\LiteStep\litestep.exe
previousProjectorProcessID=0

(add the below at the end and remove the ; when switching back and add the ; to the beginning of the line where litestep is to remove litestep.)
;shell=C:\Windows\Explorer.exe

Heres how it looks when you change to normal explorer again.

[boot]
oemfonts.fon=vgaoem.fon
system.drv=system.drv
drivers=mmsystem.dll power.drv
user.exe=user.exe
gdi.exe=gdi.exe
sound.drv=mmsound.drv
dibeng.drv=dibeng.dll
comm.drv=comm.drv
mouse.drv=lmouse.drv
keyboard.drv=keyboard.drv
*DisplayFallback=0
fonts.fon=vgasys.fon
fixedfon.fon=vgafix.fon
386Grabber=vgafull.3gr
display.drv=pnpdrvr.drv
;shell=C:\LiteStep\litestep.exe
previousProjectorProcessID=0
shell=C:\Windows\Explorer.exe

see the change? Just make yourself a boot disk.... all ya REALLy need :D