Computer running XP Pro, SP3 with AVG Antivirus. Client seeing popups indicative of Smitfraud and Winantiviruspro malware. Ran Malwarebytes, Smitfraudfix, removed malware. Rebooted and no desktop icons, taskbar or start button. I can get these in Safe Mode and I can get to Task Manager and run Internet Explorer. Trying to run Explorer.exe gets error message saying I do not have appropriate permissions to access the item. Ran repair install of XP and everything was fine (desktop returned to normal), until I reinstalled SP3. It then returned to the same behavior. It displays a malware message before the Welcome screen.