How do I remove PSO NGS beta client from my PC?

As the title says. It's taking up lots of my hard drive space and I cannot delete this damn folder due to some permission issues.

Find it in your Start Menu, right click it and uninstall it. It is as simple as that

@Ragnawind except that it isn't there anymore and all I have left is an NGS folder taking up more than 20gb of space in WindowsApps.