Viz Vista by Ed Tittel

In yesterday's blog, I reported on the appearance of reports for numerous (9 one day, 10 the next) "corrupt and unusable" VolumeShadowCopyXX entries in the System Log in Event Viewer. All of these originated from source Ntfs, the Vista file system manager.

In the past couple of months, I 've been grappling with graphics stability issues. Mostly, this has meant driver restarts where you get a message that reads something like "Display driver stopped responding and has recovered." Occasionally, this has involved a BSOD that mentions the Nvidia driver files nvlddmkm.dll or nvlddmkm.sys. When it happens, it seldom occurs more than twice a week. I keep checking the Nvidia driver download page, grabbing new drivers as they become available (including occasional betas), and hoping for the best.

This looked just plain weird to me. When I checked Reliability Monitor and the installation of the generic volume shadow copy devices I couldn't make out a pattern even though it was there to be found. I even posted queries about this to vistaforums.com, techsupportforum.com, and to Microsoft Tech Support, but it took a Facebook email to one of the demiurges in the Windows pantheon--namely, Mark Russinovich--to get to the bottom of the matter (more on this to follow at the end of this story).

This morning, I began my day with some modest self-congratulation, or perhaps just a small sigh of relief that my recent Vista crises have abated. It's now been 9 days since my last bluescreen and my System Stability Index in Reliability Monitor is nearly at 8.0 for the first time since August 11. I sincerely hope I'm not jinxing myself to make this statement but it appears that my production system is finally stable. Zounds! What a wild ride it's been.

In keeping with my ongoing Vista troubleshooting exercise, I've gotten into the habit of dropping in on my Event Viewer every couple of days to see what kinds of errors and warnings are popping up. By keeping tabs on this information, and researching stuff I haven't seen before or don't understand, I keep learning more and more interesting stuff about Vista. This morning, I found a new error from the Volume Shadow Copy Service (which shows up in the Windows Application log as a source named VSS). Because VSS is important to maintaining Vista operating and file system integrity, I started digging more deeply into this right away.