Error 5: Access is denied. when you try to start the DHCP Client service

When you start your computer, or try to start the DHCP client service, you may receive the following error:

Could not start the DHCP Client service on Local Computer.
Error 5: Access is denied.

This problem may occur after an upgrade from Windows 2000 to 2003, or after you’ve changed permissions in the registry.

In most cases, this error can easily be solved by granting extra permissions in the registry.
To make the permission changes in the registry, do the following:

1. Click Start, click Run, type regedit and click OK
2. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dhcp
3. Right click the key DHCP and click Permissions. Click Add, type network service and click OK
4. Select NETWORKSERVICE and check the Full control box to grant NETWORKSERVICE full control on the DHCP key.
5. Click OK to apply the changes and to close the window

Do the same for the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TcpIp:

1. Click Start, click Run, type regedit and click OK
2. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TcpIp
3. Right click the key TcpIp and click Permissions. Click Add, type network service and click OK
4. Select NETWORKSERVICE and check the Full control box to grant NETWORKSERVICE full control on the TcpIp key.
5. Click OK to apply the changes and to close the window

To start the service, click Start, click Run, type services.msc and click OK
Right click DHCP client and click Start

Alternatively, you could click Start, click Run, type net start dhcp and click OK
The DHCP client service should now start