Explanation:

Structural unemployment refers to the type of unemployment that occurs due to changes in the structure of the economy, such as technological advancements, changes in consumer demand, or shifts in production methods. In this case, the installation of computers that workers do not know how to operate has resulted in job losses. Here's a detailed explanation of why structural unemployment is the correct answer:

1. Definition of Structural Unemployment:
- Structural unemployment occurs when the skills and qualifications of workers do not match the requirements of available jobs.
- It arises due to long-term changes in the economy, such as technological advancements, shifts in consumer preferences, or changes in production methods.

2. Installation of Computers:
- The installation of computers in the workplace indicates a technological advancement.
- Computers can automate various tasks and increase productivity, leading to a potential reduction in the need for certain types of jobs.

3. Lack of Knowledge and Skills:
- The workers who have lost their jobs due to the installation of computers do not know how to operate them.
- This lack of knowledge and skills makes them unable to meet the requirements of the newly created jobs that involve operating computers.

4. Mismatch between Skills and Job Requirements:
- The workers' lack of knowledge and skills in operating computers creates a mismatch between their skills and the job requirements.
- As a result, they become structurally unemployed because they are unable to find suitable employment in the changing economic structure.

5. Impact of Structural Unemployment:
- Structural unemployment can have long-lasting effects on the economy and individuals.
- It can lead to a decrease in overall employment levels, lower wages for affected workers, and reduced economic growth.
- Retraining programs and educational initiatives may be necessary to help these workers acquire the skills needed for new job opportunities.

Therefore, the installation of computers, which workers do not know how to operate, resulting in job losses, is an example of structural unemployment.