In the enterprise enviroment they use a Policy Editor to establish a group policy to control your desktop computers on the network. I like listening to WEB Radio and access to assorted web sites they the SysAdmin types keep you from getting to via the the Regisrty setting of your computer during startup AND during a refresh of your registry at times they determine. You tell if you have this problem by going to your Internet Options in IE4 or IE5. If your buttons to change the Security setting are not in focus. You have to delete certain value names from deep in the registry.
RegistryDeleteValue rrkHKeyLocalMachine, _ "SOFTWAREPoliciesMicrosoftWindowsCurrentVersionInternet Settings", _ "Security_options_edit" RegistryDeleteValue rrkHKeyLocalMachine, _ "SOFTWAREPoliciesMicrosoftWindowsCurrentVersionInternet Settings", _ "Security_zones_map_edit" RegistryDeleteValue rrkHKeyLocalMachine, _ "SOFTWAREPoliciesMicrosoftInternet ExplorerInfodeliveryRestrictions", _ "NoJITSetup" RegistryDeleteValue rrkHKeyLocalMachine, _ "SOFTWAREPoliciesMicrosoftInternet ExplorerInfodeliveryRestrictions", _ "NoUpdateCheck"