This will remove all the folders to allow you to log back into battle.net.

BattleNetClientFix.ps1

#requires -RunAsAdministrator

<#
.SYNOPSIS
    This will remove all the folders to allow you to log back into battle.net.
.DESCRIPTION
    This will remove all the folders to allow you to log back into battle.net.
.INPUTS
    None
.OUTPUTS
    None
.EXAMPLE
    PS C:\> . .\BattleNetClientFix.ps1
.NOTES
    You will need to re auth after this is run, so if you have an authenticator method bound to your account, you will need that.
    And you will need to repoint the app to where your installed games are.
    Admin rights are needed as this will force end processes and delete directories.
.LINK
    https://dotps1.github.io
.LINK
    http://us.battle.net/forums/en/bnet/topic/20752075014?page=1
#>

$processes = @(
    "Agent"
    "Battle.net",
    "Battle.net Helper"
)

foreach ($process in $processes) {
    if (Get-Process -Name $process -ErrorAction SilentlyContinue) {
        Stop-Process -Name $process -Force
        
        # Test is process is still running.
        while (Get-Process -Name $process -ErrorAction SilentlyContinue) {
            Start-Sleep -Seconds 1
        }
    }
}

# Folder names of battle.net shit.
$folders = @(
    "Battle.net",
    "Blizzard Entertainment"
)

# Places where those folders may exist.
$folderLocations = @(
    $env:APPDATA,
    $env:LOCALAPPDATA,
    $env:ProgramData
)

# loop through each location, if the folder exists in the location, delete it.
foreach ($folderLocation in $folderLocations) {
    foreach ($folder in $folders) {
        $target = Join-Path -Path $folderLocation -ChildPath $folder
        if (Test-Path -Path $target) {
            Remove-Item -Path $target -Confirm:$false -Recurse -Force
        }
    }
}