Hi,
Have you made any changes to your computer prior to the issue?
Steps mentioned below will clear the registry settings made within MSConfig which returns the settings to factory defaults:
a. Click on Start, in the search bar type ‘regedit’ and press enter.
b. Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSConfig\state. Delete all sub-keys found within this folder.
c. Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSConfig\services. Delete all sub-keys found within this folder.
d. Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSConfig\startupfolder. Delete all sub-keys found within this folder.
e. Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSConfig\startupreg. Delete all sub-keys found within this folder.
f. Reboot the computer and check with the issue.
Note: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
How to back up and restore the registry in Windows
http://windows.microsoft.com/en-US/windows7/Back-up-the-registry