KB Article: http://support.microsoft.com/kb/933757

INTRODUCTION

Event ID 7000 or event ID 7026 is logged in the System logon a computer that is running one of the following operating systems:

·         Windows 7

·         Windows Server 2008 R2

·         Windows Vista

·         Windows Server 2008

This problem may occur if a device is not connected to the computer but the driver service of the device is enabled. For example, the following events are logged when the computer does not have a parallel port, a DVD drive, or a CD drive.

On a Windows 7-based or Windows Server 2008 R2-based computer

Source: Service Control Manager
Event ID: 7026
Description:
The following boot-start or system-start driver(s) failed to load:
cdrom

Source: Service Control Manager
Event ID: 7000
Description:
The Parallel port driver service failed to start due to the following error:
The service cannot be started, either because it is disabled or because it has no enabled devices associated with it.

On a Windows Vista-based or Windows Server 2008-based computer

Source: Service Control Manager Eventlog Provider
Event ID: 7026
Description:
The following boot-start or system-start driver(s) failed to load:
cdrom

Source: Service Control Manager Eventlog Provider
Event ID: 7000
Description:
The Parallel port driver service failed to start due to the following error:
The service cannot be started, either because it is disabled or because it has no enabled devices associated with it.