Question 1: Is the registry corrupted? This is one of the areas that can cause the task bar to disappear. The registry could have some files corrupted. The registry file that deals with display could be corrupted. It is therefore important that we look at the Windows registry.
Question 2: Is there a system file or device driver which is missing? It is possible that during the installation process, or during the addition of other files, a system file could have been deleted accidentally; this is usually solved by repairing the Windows.
Question 3: Is there a chance that the bootdv.dll file could have been deleted? This file is the one that is responsible for displaying the Windows logo and internal scroll bar. This file could be missing and therefore the failure to display the scroll bars[ CITATION Kar08 \l 1033 ].
Question 4: Could the session manager be stopped? There are chances that the session manager could have been stopped. If this is the case, there will be the need to look at this service in the task manager options.
Question 5: Is the NTLDR file working? It could suffice to know if the file is still working. This file has two parts, which are the osloader module and the startup module. It has a big role in starting up the operating system. There will be the need to assess eth status of this file.
Question 6: Was the computer recently attacked by a virus/Trojan/worm? There are chances that this behavior is caused by a virus, which attacked the computer before the behavior started. It is therefore a necessity that after the computer has been booted, there will be the need to run a virus scan[ CITATION Kar08 \l 1033 ].
Karp, D. A. (2008). Windows Vista annoyances. New York: O'Reilly Media, Inc.