Unsigned drivers got you down? Are you like me and hate that bootpro program more than having to press a button? Well I have the cure, tested on Windows Vista home Premium x64 with SP1. I'm still laughing that someone bothered to write that little program to click some options on every boot. Here you go, this is exactly the same as "Warn but don't Block", or whatever it's called, on xp. All day i could not install ATITool, even after using f8. I applied this tweak and presto. Not sure if i rebooted or not, probably stopping and restarting explorer should be sufficient. Go to C:\Windosw\Inf directory. Find the file Sceregvl.inf. Might want to make a backup copy elsewhere before moving on. Under the section [Register Registry Values] you will copy and paste the following: MACHINE\Software\Microsoft\Driver Signing\Policy,3, "Devices: Unsigned driver installation behavior",3,0| DriverSigning0="Silently succeed ",1|"Warn but allow installation",2|"Do not allow installation" then save the file and close it open the "run" dialog box, and type the following regsvr32 "scecli.dll" (no quotes) . POW THAT IS ALL from now on you will simply be asked if you want to install the driver.