I have a Dell Studio 17 (1737) laptop connected to an external monitor, with Vista Home Premium.
As part of a Windows Vista update I checked the box to get the optional Intel Display driver update 220.127.116.119.
After the reboot at the end of the update process the image on the monitor distorted and so large that I could
not even see the login button; fortunately the fingerprint login worked. After a few minutes the video readjusted itself
to normal (odd, but OK).
See a photo of the screen below (looks worse in real life).
But after starting from Hibernate mode this morning the display had several problems:
It used it's internal display, not the external monitor.
The display was the correct size but appeared to have terrible 'interference'.
This interference was the same at all display settings (resolutions).
It failed to switch to the ext mon after I selected it in the Display Settings.
I did a restart, but got the same results.
After a few minutes it finally detected and switched to the ext mon which
now had a normal good full size image.
I could not get rid of this problem until I used Window's Restore to rollback
to the restore point saved before the update, which re-installed the old
Intel drive 18.104.22.1686 dated 10/7/2008 (apparently the original driver).
It appears MS released this for updates 7-2-2010 (I wait a week before
installing downloaded updates).
I couldn't find this mentioned in MS or Dell forums so I'm posting it here
to document the problem.