Personalization allows you to create and modify themes. But there does not seem to be any way to delete them. I have been unable to locate the folder they are in.
OS is WIN7

Is it possible to delete unwanted themes?
Where are they located?

Thanks

Choose personalize and then find the theme you want to delete. Right click on it and you should see "delete theme" in a box next to it.

For some unknown reason right clicking on the theme often does not provide the delete option. After it finally worked I have experimented and find that it does not always include delete. A mystery, but at least I now know to persevere and it will eventually allow me to delete an unwanted theme.