How to change the download location of games through Origin?

I want to change the download location of games, but on the 'Installs & Saves' tab it won't let me choose my D:\ partition, where I normally download my games. Even at the install of Origin I can't select that drive.
How can I change that?

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Solution 1:

You need to add the navigation pane back:

Navigation Pane

Click on Organise -> Layout -> Navigation Pane

You should get back all your drives/etc then.

If that doesn't help - could you follow these instructions and post a screenshot of what does appear in the navigation pane.