diff --git a/README.md b/README.md
index 95b4d5a..ef76edb 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,17 @@
+VirtualBox enviropment kit
+==========================
+
+Requirements
+------------
+
+- VirtualBox with VirtualBox Extension Pack
+- procps
+- expect
+- Cygwin for Windows host PC
+
+Run
+---
+
 In order to successfully run Mirantis OpenStack under VirtualBox, you need to:
 - download the official release (.iso) and place it under 'iso/' directory
 - run "./launch.sh" (or "./launch\_4GB.sh", "./launch\_8GB.sh" or "./launch\_16GB.sh" according to your system resources). It will automatically pick up the iso and spin up master node and slave nodes
diff --git a/actions/check-available-memory.sh b/actions/check-available-memory.sh
new file mode 100644
index 0000000..14530c2
--- /dev/null
+++ b/actions/check-available-memory.sh
@@ -0,0 +1,44 @@
+#!/bin/bash 
+
+#    Copyright 2014 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+#
+# This script check availble memory on host PC for quality provision VMs via VirtualBox
+#
+
+total_memory=$(get_available_memory $os_type)
+
+if [ $total_memory -eq -1 ]; then
+  echo "Launch without checking RAM on host PC"
+  echo "Auto check memory is unavailable, you need install 'top' and 'free'. Please install procps package."
+else
+  # Count selected RAM configuration
+  for machine_number in $(eval echo {1..$cluster_size}); do
+    if [ -n "${vm_slave_memory_mb[$machine_number]}" ]; then
+      vm_total_mb=$(( $vm_total_mb + ${vm_slave_memory_mb[$machine_number]} ))
+    else
+      vm_total_mb=$(( $vm_total_mb + $vm_slave_memory_default ))
+    fi
+  done
+  vm_total_mb=$(( $vm_total_mb + $vm_master_memory_mb ))
+
+  # Do not run VMs if host PC not have enough RAM
+  can_allocate_mb=$(( ($total_memory - 524288) / 1024 ))
+  if [ $vm_total_mb -gt $can_allocate_mb ]; then
+    echo "Your host has not enough memory."
+    echo "You can allocate no more than ${can_allocate_mb}MB, but trying to run VMs with ${vm_total_mb}MB"
+    exit 1
+  fi
+fi
\ No newline at end of file
diff --git a/actions/prepare-environment.sh b/actions/prepare-environment.sh
index 8187c98..e386522 100755
--- a/actions/prepare-environment.sh
+++ b/actions/prepare-environment.sh
@@ -27,6 +27,12 @@ source config.sh
 source functions/vm.sh
 source functions/network.sh
 
+# Check for procps package
+echo -n "Checking for 'top' and 'free'"
+free -V >/dev/null 2>&1 || { echo >&2 " \"free\" is not available in the path, but it's required. Please install \"procpc\" package. Aborting."; exit 1; }
+top -v >/dev/null 2>&1 || { echo >&2 " \"top\" is not available in the path, but it's required. Please install \"procpc\" package. Aborting."; exit 1; }
+echo "OK"
+
 # Check for expect
 echo -n "Checking for 'expect'... "
 expect -v >/dev/null 2>&1 || { echo >&2 " \"expect\" is not available in the path, but it's required. Please install Tcl \"expect\" package. Aborting."; exit 1; }
diff --git a/config.sh b/config.sh
index 159970e..45cd20e 100755
--- a/config.sh
+++ b/config.sh
@@ -178,23 +178,3 @@ fi
 vm_slave_first_disk_mb=65535
 vm_slave_second_disk_mb=65535
 vm_slave_third_disk_mb=65535
-
-total_memory=$(get_available_memory $os_type)
-
-# Count selected RAM configuration
-for machine_number in $(eval echo {1..$cluster_size}); do
-  if [ -n "${vm_slave_memory_mb[$machine_number]}" ]; then
-    vm_total_mb=$(( $vm_total_mb + ${vm_slave_memory_mb[$machine_number]} ))
-  else
-    vm_total_mb=$(( $vm_total_mb + $vm_slave_memory_default ))
-  fi
-done
-vm_total_mb=$(( $vm_total_mb + $vm_master_memory_mb ))
-
-# Do not run VMs if host PC not have enough RAM
-can_allocate_mb=$(( ($total_memory - 524288) / 1024 ))
-if [ $vm_total_mb -gt $can_allocate_mb ]; then
-  echo "Your host has not enough memory."
-  echo "You can allocate no more than ${can_allocate_mb}MB, but trying to run VMs with ${vm_total_mb}MB"
-  exit 1
-fi
diff --git a/functions/memory.sh b/functions/memory.sh
index fa66900..09b3596 100644
--- a/functions/memory.sh
+++ b/functions/memory.sh
@@ -25,7 +25,7 @@ get_available_memory() {
     if [ "$(which free)" != "" ]; then
       # using free
       total_memory=$(LANG=C free | grep Mem | awk '{print $2}')
-    elif [ $(which top) != '' ]; then
+    elif [ "$(which top)" != "" ]; then
       # using top
       total_memory=$(LANG=C top -n 1 | grep "Mem:" | awk '{ print $4 }')
     else
@@ -45,7 +45,7 @@ get_available_memory() {
     if [ "$(which free)" != "" ]; then
       # using free
       total_memory=$(LANG=C free | grep Mem | awk '{print $2}')
-    elif [ $(which top) != '' ]; then
+    elif [ "$(which top)" != "" ]; then
       # using top
       total_memory=$(LANG=C top -n 1 | grep "Mem:" | awk '{ print $4 }')
     else