My system has developed a problem at shutdown. The system hangs before you get the options to shutdown, restart and I have to power down the pc to shutdown. I have all service packs (sp1 and sp2)and updates installed and my antivirus software is up to date. I have also checked if any programs are running in the background but no programs are running and system idle is 98 percent My system is a Dell 8300. Any idea what is causing the problem.