Best Answer: Here is the answer to what Kernel is:
"Most OSs require a way to separate user applications from the OS's core services. To achieve this, Windows 2000 has two modes, user and kernel. A user mode program can't read or write directly to the OS memory; instead it can access its own virtual 4GB memory (2GB for applications, 2GB for OS), which a kernel process—the Virtual Memory Manager—controls. The Virtual Memory Manager then writes directly to the OS memory.
Basically, the system uses the kernel for critical OS services, which are kept separate from user programs to prevent the user programs from crashing the OS. The main parts of Win2K that run in kernel mode are the hardware abstraction layer (HAL—applications can't talk directly to hardware), NT Kernel, and NT Executive."
As for the rest of it, what is the specific message you get from your AV software when the system is trying to update?. Are you set up for Windows automatic updates? What AV software are you using? Is the update coming from Microsoft?
Go to "Check for updates" and see if there is an update to the NT Kernel listed as not being installed and if it is a critical update or not. If not critical, you may not need it but if critical then you need to install it but do it manually instead of through auto update. When doing it manually you may be instructed to turn off your AV software since this is updating part of the operating system.
Hope this helps