diff --git a/test/acceptance/base.rb b/test/acceptance/base.rb
index 16645256f..38a427359 100644
--- a/test/acceptance/base.rb
+++ b/test/acceptance/base.rb
@@ -2,9 +2,10 @@ require "rubygems"
 require "contest"
 require "log4r"
 
-require File.expand_path("../helpers/config.rb", __FILE__)
+require File.expand_path("../helpers/config", __FILE__)
 require File.expand_path("../helpers/isolated_environment", __FILE__)
-require File.expand_path("../helpers/output.rb", __FILE__)
+require File.expand_path("../helpers/output", __FILE__)
+require File.expand_path("../helpers/virtualbox", __FILE__)
 
 # Enable logging if requested
 if ENV["ACCEPTANCE_LOGGING"]
@@ -57,6 +58,9 @@ class AcceptanceTest < Test::Unit::TestCase
   end
 
   setup do
+    # Wait for VBoxSVC to disappear
+    Acceptance::VirtualBox.wait_for_vboxsvc
+
     # Setup the environment so that we have an isolated area
     # to run Vagrant. We do some configuration here as well in order
     # to replace "vagrant" with the proper path to Vagrant as well
@@ -71,6 +75,6 @@ class AcceptanceTest < Test::Unit::TestCase
   end
 
   teardown do
-    @environment.close
+    @environment.close if @environment
   end
 end
diff --git a/test/acceptance/helpers/isolated_environment.rb b/test/acceptance/helpers/isolated_environment.rb
index 46882e848..b45781596 100644
--- a/test/acceptance/helpers/isolated_environment.rb
+++ b/test/acceptance/helpers/isolated_environment.rb
@@ -5,6 +5,7 @@ require "log4r"
 require "posix-spawn"
 
 require File.expand_path("../tempdir", __FILE__)
+require File.expand_path("../virtualbox", __FILE__)
 
 module Acceptance
   # This class manages an isolated environment for Vagrant to
@@ -109,6 +110,17 @@ module Acceptance
 
     # Closes the environment, cleans up the temporary directories, etc.
     def close
+      # Only delete virtual machines if VBoxSVC is running, meaning
+      # that something related to VirtualBox started running in this
+      # environment.
+      delete_virtual_machines if VirtualBox.find_vboxsvc
+
+      # Delete the temporary directory
+      @logger.info("Removing isolated environment: #{@tempdir.path}")
+      FileUtils.rm_rf(@tempdir.path)
+    end
+
+    def delete_virtual_machines
       # Delete all virtual machines
       @logger.debug("Finding all virtual machines")
       execute("VBoxManage", "list", "vms").stdout.lines.each do |line|
@@ -125,10 +137,6 @@ module Acceptance
       end
 
       @logger.info("Removed all virtual machines")
-
-      # Delete the temporary directory
-      @logger.info("Removing isolated environment: #{@tempdir.path}")
-      FileUtils.rm_rf(@tempdir.path)
     end
 
     # This replaces a command with a replacement defined when this
diff --git a/test/acceptance/helpers/virtualbox.rb b/test/acceptance/helpers/virtualbox.rb
new file mode 100644
index 000000000..f63b7b69c
--- /dev/null
+++ b/test/acceptance/helpers/virtualbox.rb
@@ -0,0 +1,36 @@
+require 'sys/proctable'
+
+module Acceptance
+  module VirtualBox
+    extend self
+
+    # This method will wait for the "VBoxSVC" process to end. This will
+    # block during that time period. The reason for this is because only
+    # one "VBoxSVC" can run per user and manages all state within VirtualBox.
+    # Before you can run VirtualBox with a custom home directory, you must
+    # wait for this VBoxSVC process to die.
+    def wait_for_vboxsvc
+      time_passed = 0
+      while find_vboxsvc
+        if time_passed > 5
+          raise Exception, "VBoxSVC process is not going away."
+        end
+
+        sleep 1
+        time_passed += 1
+      end
+    end
+
+    # This method finds the VBoxSVC process and returns information about it.
+    # This will return "nil" if VBoxSVC is not found.
+    def find_vboxsvc
+      Sys::ProcTable.ps do |process|
+        if process.comm == "VBoxSVC"
+          return process
+        end
+      end
+
+      nil
+    end
+  end
+end
diff --git a/vagrant.gemspec b/vagrant.gemspec
index 5b278bde3..34762a619 100644
--- a/vagrant.gemspec
+++ b/vagrant.gemspec
@@ -29,6 +29,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "minitest", "~> 2.5.1"
   s.add_development_dependency "mocha"
   s.add_development_dependency "posix-spawn", "~> 0.3.6"
+  s.add_development_dependency "sys-proctable", "~> 0.9.1"
 
   s.files         = `git ls-files`.split("\n")
   s.executables   = `git ls-files`.split("\n").map{|f| f =~ /^bin\/(.*)/ ? $1 : nil}.compact