Error when i start new project - Unable to save ionic data

Hi guys,
My OS is Windows 10 Pro and i try install ionic, but i receive many errors:
I installed git and node as administrator.
I already configured the Ant, ANDROID_HOME, JAVA_HOME and put all in PATH variables.
I follow the tutorial: http://ionicframework.com/docs/guide/installation.html

So, i open git bash as administrator and i run the commands:
1 - npm install -g ionic
2 - npm install -g cordova

When i execute the command: ionic start todo blank i receive this error:

Unable to save ionic data: C:\Users\Lucas.ionic\ionic.config Error: EPERM: operation not permitted, open 'C:\Users\Lucas.ionic\ionic.config'

If i execute this command inside the folder: ionic serve -l works normally

But if i execute: ionic platform add android i receive this error:

error-ionic.png1179x234 13 KB

The android is configured correctly:

config-android.png621x632 24.6 KB

Someone can help me?
Thanks