(a computer program) won't let me (do something)

We often talk about comptuers as if they were people. This is an example:

It won't let me save.

This means "I can't save (a document)."

When you're unable to do something using a computer, you can say that the computer "won't let you" do it. Another example:

It's so annoying: it won't let me open two windows, so I have to keep closing one window and opening another.

This phrase appears in these lessons: