What is the most effective first step for a technology education teacher to take when a computer operating system has been corrupted by a virus?

The most effective first step when dealing with a corrupted computer operating system due to a virus is to back up all critical files to an external storage device. This action ensures that important data is protected and can be recovered after the virus is dealt with. If the operating system is in a compromised state, any corrective measures taken afterward could lead to further data loss, especially during processes like reinstalling the operating system or running a virus scan, which may inadvertently cause additional complications or lead to loss of unsaved files.

By securing the critical files first, the teacher can safeguard essential information that might be lost if the virus worsens or if more invasive measures are taken to resolve the corruption. Once the data is backed up, the educator can then take additional steps, such as removing the virus or restoring the operating system, knowing that their critical information is secure.