There are reports that a recent Windows update is causing problems for some users. The symptom will be a BSOD upon restart with an error code of 0X00000050.

Here are two links that explain what some users are experiencing and a possible solution.

http://bink.nu/news/restart-issues-after-installing-ms10-015.aspx
http://social.answers.microsoft.com/Forums/en-US/vistawu/thread/73cea559-ebbd-4274-96bc-e292b69f2fd1

This appears to be affecting all versions of Windows.

At this point, we are not advising anyone not to apply updates. If we start to see issues here in the Support Centre, we will update the advisory.

As always, keep current backups of data files to ensure quick recovery from issues such as these.

If you experience this error, please contact us in the Support Centre at 36666