Iria

"It seems that Microsoft has forgotten end users when it introduced a very restricted module of driver signature enforcement in Windows Vista and Windows 7. All drivers and system files must be digitally verified or they cannot run when using both 32-bit and 64-bit versions of Windows Vista and Windows 7. In the past, it was possible to turn that feature off in Vista, but due to new kernel security updates, it is impossible to turn it off without degrading security and stability of your operating system or putting your master boot records in risk by using other software alternatives.

So what is the problem with digital certificates? Well, the problem is… developers have to pay Microsoft to receive verified certificates, and that makes many applications inaccessible under Windows Vista and Windows 7. However, it is still possible to turn it off by pressing the F8 function key during system boot up, but pressing F8 every time on boot up can be a serious pain in the butt. Others have found workarounds, but most of them are too risky and may trash your master boot records, at least until now thanks to our latest tool."
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Source: NGOHQ