That's a point actually - Vista SP2?
Thanks for the replies. Yes, I was using Vista SP2.
Since I had the issues with the screen coming up black (sometimes unplugging the DVI cable from the PC, then plugging it back up fixed this) when I used the Windows 7 drivers for the Intel HD Graphics with Windows Vista, I assumed that the issues were because of my non-standard use of the drivers (copying the Windows 7 instructions to the Vista section in the INF).
I decided to bite the bullet and purchase a copy of Windows 7 Pro to go on this system (the is a HTPC build). I had previously tried to install OpenELEC on it, and the video worked perfectly on that--but, OpenELEC wouldn't recognize my USB WIFI. Since this HTPC is going in a room without an ethernet connection, I really needed the WIFI to work. I could probably eventually find a USB WIFI device that would work with OpenELEC. However, I figured if I put Windows Vista or Windows 7 on this, I could use the system for internet browsing and such instead of a movie-only box.
Anyway, after install Windows 7, I encountered the same problem (black screen on boot up). This led me to believe that this wasn't a problem that was necessarily related to my trying to use the Windows 7 driver with Vista. After doing a search, I've found that there are many people experiencing this same issue with Windows 7/8 with many threads showing on Intel's message boards. In fact, the posts stretch back all of the way from 2012 to present day! This seems to be related to the lack of communication between the Intel HD Graphics and the monitor--the monitor doesn't detect that there is a video signal after the initial boot-up and blanks when it gets to the log-on screen. I'm amazed that Intel has not figured this out yet.
I guess I'll have to add a low profile PCI-E video card to this system. The money pit (i.e., my HTPC) keeps getting bigger!!!