I have recently ran into an issue with the Boot-Time Scan in Vista on a new Acer Laptop. Whenever trying to run the boot-time scan, I found that all I would get is a blank black screen. Hard drive activity indicated that the scan was running in the background, but nothing was being displayed on the screen.
I did some searching, and remembered that I had customized by Boot Splash screen, and as such selected the "No GUI Boot" option in msconfig. Once I unselected it, the boot-time scan worked normally again.
Is there anyway to get the boot-time scan to work with a custom Boot Splash screen?