USB not identified

From time to time, my computer says that my Arduino is not identified. Before reinstalling Arduino IDE was enough, but it didn't work this time. My COM port is just not available. What should I do ?

This is a common occurrence with multiple causes.

Almost all are covered in this section if you care to use the search feature at the top right of the screen.

Might I also suggest you read the sticky posts at the top of this section too as they provide valuable guidance in how best to get an answer.