Hi! I am using windows xp pro SP2, with all windows updates made. I also use Kaspersky as antivirus and sygate as firewall. Everything was working fine until i decided to apply Safexp (http://www.theorica.net/safexp.htm) on my computer. I selected a lot of options to increase my computer security and privacy. A lot of options worked fine and i also noticed a lot of speed improvements. But.. I am a massive user of fast user switching utility of windows XP. It stoped working. 1)I lost windows key+L function(it started to block my computer insted going to welcome screen) 2)On Task manager(control+alt+delete) on tab "process" there is no respective user to process, it is blank (only inactive process have "system"), on tab "users" no user is logged in. So, i decided to look arround and i checked that "use fast user switching" was disabled on Control panel. I try to enable it but it doesn't worked. I applyed "Secure Desktop undo" and "Restore Fast User Switching" of http://www.kellys-korner-xp.com/xp_tweaks.htm i a got back my windows key+L function, welcome screen back and teh option of control painel checked. I was happy until that when i try to have 2 (or more) users logged on at same time Welcome Screen loops when trying to log on. I can only have a user at once. I already contacted Safexp forum and technical support, but no answers. Please, i really need help and (re)format is out of question. Any help is welcome. Thanks for all and sorry bad english. Guilherme