HOW TO CHANGE THE WINDOWS WELCOME SCREEN USING SOFTWARE 

STEP 1: FIRSTLY, DOWNLOAD THE SOFTWARE NAMED “WINDOWS 7 LOGON BACKGROUND CHANGE”
STEP 2: TO DOWNLOAD VISIT THIS SITE www.softpedia.com/get/tweak/system-tweak/windows-7-logon-background-changer.shtml
STEP 3: CLICK ON “DOWNLOAD” AND SELECT “EXTERNAL MIRROR 1”
STEP 4: THE FILE WILL START DOWNLOADING
STEP 5: EXTRACT THE FILES AND INSTALL THIS SOFTWARE
STEP 6: OPEN IT AND CLICK ON “CHOOSE A FOLDER” AND SELECT A PATH WHERE YOUR DESIRED WALLPAPER IS THERE.
STEP 7: SELECT THE PICTURE AND CLICK ON “APPLY”
STEP 8: AND IT WILL BE DONE.
STEP 9: TO SEE THE LOGON SCREEN RESTART THE PC.

STEP 10: NOW YOU CAN SEE THE LOGON SCREEN WILL BE CHANGED TO YOUR DESIRED ONE.