The Windows Firewall Service and DHCP services Fails to start

Method 1: Try the steps given in the link below to fix this issue:

http://support.microsoft.com/kb/943996

Note: The steps provided in this article is applicable to Windows 7 Operating system as well.

Method 2: Follow this method to delete the registry key

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 windows help article below.

Back up the registry
http://windows.microsoft.com/en-us/windows7/Back-up-the-registry

Delete the registry key:

a. Go to start and type regedit.exe.
b. Navigate to the location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc.
c. Delete the item by right clicking on it and selecting delete.
d. Close registry editor.

Regards,

Prashob