You need to be the Administrator to access some shares. On Windows 10 the real Administrator account is disabled by default.
If you want to be able to access all your folders using shares such as "C:", you can enable the Administrator account and give it a password. Then configure FileBrowser to use "Administrator" in the "Username" field.
If your user looks like A, B or C below then that is not enough to access Admin shares. Please follow the steps below to enable the Administrator account.
Start a Command Prompt as Administrator
Press the Windows key and type 'Command" once the Command Prompt App appears select 'Run as administrator'.
Click OK if you are presented with a confirmation popup message box.
In the new Command Prompt, enter "net user administrator /active:yes".
The Administrator password must be strong, otherwise your system will not be secure. We recommend using a password that has uppercase and lowercase letters, at least 1 number and at least one punctuation mark.
Press the Windows key and type 'Control" select the Control Panel App from the listing.
Click 'Change account type' under 'User Accounts'
* If your Control Panel looks different, change its 'View by:' in the top right corner to 'Category'
You will now see all your users. There should be one that is named "Administrator", with "Administrator" listed under it as well. This is the real Admin account.
* If you don't see your new Adminstrator account, close the Control Panel and re-open it.
Select the Adminstrator account and then click "Create a password" in the left hand pane and then enter a strong password.
In FileBrowser use "Administrator" as your username when connecting to your Windows 10 PC.
Follow the instructions as per Enabling the Administrator account above but replace step 3 with "net user administrator /active:no"