Microsoft released data on exactly what drivers caused Windows Vista crashes as part of an ongoing "Vista Capable" class action lawsuit. The data indicates NVIDIA drivers were responsible for 28.8% of Windows Vista crashes while Intel and ATI accounted for only 8.8% and 9.3%, respectively.
The problem with reports of buggy drivers is that no one can really tell if the drivers are actually at fault, or if the computer experiencing the driver crash has some other underlying problem contributing to the crash.
As part of the ongoing Vista Capable class action lawsuit, Microsoft released data on exactly what drivers caused the bulk of logged Windows Vista crashes. The number one culprit of Vista crashes related to driver failure was NVIDIA at 28.8%. Microsoft only broke logged crashes out for a few companies including NVIDIA, Intel (8.8%) and ATI (9.3%). Microsoft’s data shows that it was responsible for 17.9% of logged crashes.
The main early adopters of Vista were PC enthusiasts; the hardware of choice for PC enthusiasts at the time was NVIDIA G80 GPUs so it would be natural that more crashes would be logged as caused by a NVIDIA driver. Ars Technica also points out that the Microsoft data doesn’t specify if the crashes logged are from multiple machines or a group of particularly error prone computers experiencing multiple crashes.