According to our translation, we understand that your computer is missing curcial files in order to connect to the Internet either wireless or via an Ethernet cable.
In this particular case, we recommend to contact Dell* in order to obtain the lates drivers that are fully compatible with your system.
On our best effort to help you with this situation, here is the link to Dell* support in Portuguese: Suporte Tecnico Dell - Telefones 0800
Now, if this situation is related only with the Ethernet controller, we advise to post in this forum: Wired Ethernet
If the situation is related to your wireless connection only, please let us know the name and model of your wireless adapter. Regarding this specifically, we recommend to contact the Dell* first as their drivers are designed for their system while our drivers found in our download center are generic and may not meet all the requirements of the computer manufacturer.
Please, let us know as soon as you can if the information above helped you to resolve this situation.
According to our translation, we understand you are experiencing diffulties to contact Dell*.
Before we go any further, the picture you sent us when you first contacted us suggests that this situation is related to your wired commnection. For this specific support, you can find assistance through the proper forum as it was informed previously. For your convenience, here is link to this forum: Wired Ethernet
Regarding Dell*, on our best effor to assist you, here is a link to Dell* Support in Portuguese. The support site suggests to have the computer serial number handy so you can enter this information for proper support. Suporte Dell* or this other one: Entre em Contato com o Suporte Técnico here is an example of what you should look for on your computer:
Now, have you tried to connect wirelessly? If you are experiencing any situation related to the wireless connection, our first recommendation is for you to contact also Dell* as they have the drivers that is right for the type of system you have.
As a second option. You can also try our drivers found in our download center but we do need to know the name of your wireless adapter in order to provide proper support as this forum is related only to wireless adapters and not wired ones.
*If you prefer to have assistance in Portuguese, please call this number: 0800-892-1512 or access this link: Entrar em Contato com o Suporte Técnico da Intel and choose the product you are needing assistance for.