Once you have created a Windows instance you’ll need to retrieve the Admin password.
The Admin password is encrypted using your Key Pair. To decrypt it, you’ll need to retrieve your Private Key.
You can either paste the private key or upload a private key file. Afterwards just hit the “Decrypt Password” button to retrieve the Admin password.
Now that you’ve got the Admin password you can use Remote Desktop to connect to your Windows instance.
If you are not able to connect look here for Troubleshooting Experience