After connecting the modem to the PC, what is the first step to access the internet?

To access the internet after connecting the modem to the PC, it is essential to assign the customer a username and password. This step is crucial because most internet service providers (ISPs) require authentication details to establish a secure connection to their network. The username and password are typically provided to the customer upon setting up their service. Only after entering these credentials can the modem successfully connect to the ISP's network, allowing internet access.

Other actions such as installing antivirus software, running system updates, or resetting the modem may be important in their own context but do not directly facilitate immediate access to the internet. Antivirus software and system updates can enhance security and performance but are not prerequisites for establishing an internet connection. Resetting the modem might solve issues or reconnect services, but it does not inherently provide the necessary credentials for access. Therefore, assigning a username and password is the correct and foundational step to ensure the device connects properly to the internet.