Error 800b0100 when trying to install guest additions

[visat]

So, I was trying to install VBox's guest additions on my Windows Vista VM, but it shoots me an error every time I try. It says, "No signature was present in the subject.". And it also says that the exit code was exit code 2. And it also says that it had an error executing, "C:/Program Files/Oracle/VirtualBox Guest Additions/VBoxDrvInst.exe". Can someone please help me out with what is even going on with all of this? Thank you!

[scottgus1]

Vista's security signing functions are a tad out of date. Web-search for Windows Server 2008r1 update to add SHA256 security signing. run it in Vista. Then the GAs should install.