I use the following to disable any warning messages when executing software in Windows XP SP3 and IE8 ;Disable security warnings HKCU,"SOFTWARE\Microsoft\Internet Explorer\Download","CheckExeSignatures",0x0,"no" HKCU,"SOFTWARE\Microsoft\Internet Explorer\Download","RunInvalidSignatures",0x10001,01,00,00,00 HKCU,"SOFTWARE\Microsoft\Internet Explorer\InformationBar","FirstTime",0x10001,00,00,00,00 HKCU,"SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3","1601",0x10001,00,00,00,00 HKCU,"SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3","2200",0x10001,00,00,00,00 HKCU,"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Associations","LowRiskFileTypes",0x0,".zip;.rar;.nfo;.txt;.exe;.bat;.com;.cmd;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mpg;.mpeg;.mov;.mp3;.m3u;.wav;" HKCU,"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Attachments","HideZoneInfoOnProperties",0x10001,01,00,00,00 HKCU,"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Attachments","SaveZoneInformation",0x10001,01,00,00,00