Can you elaborate on this "hindrance" affecting the boot process? What exactly is happening during bootup?
Until you discover the problem with that update that seems to be causing your problems, you can opt to simply NOT download it. If you're allowing Automatic Updates to do its job, you can select 'CUSTOM' instead of 'Express,' and you will be able to UNCHECK the update if you suspect it to be the source of the computer's problems. Which update is it?