Sorry! An error on step 6. This is the correct one:
  1. After installing the software, you will should have a desktop icon for the application. If don't go to start menu and create it. Then copy and paste that icon, so you have two on desktop. One for each network:
    Edit one icon and rename it to bitcoin mainnet and in properties change the target to this
    "C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=%APPDATA%\Bitcoin\mainnet -conf=%APPDATA%\Bitcoin\mainnet\bitcoin.conf Or if you get an error of target box not valid: "C:\Program Files\Bitcoin\bitcoin-qt.exe" -datadir=%APPDATA%\Bitcoin\mainnet -conf=%APPDATA%\Bitcoin\mainnet\bitcoin.conf
    Edit the other icon and rename it to bitcoin testnet and in properties change the target to this
    "C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=%APPDATA%\Bitcoin\testnet -conf=%APPDATA%\Bitcoin\testnet\bitcoin.conf Or if you get an error of target box not valid: "C:\Program Files\Bitcoin\bitcoin-qt.exe" -datadir=%APPDATA%\Bitcoin\testnet -conf=%APPDATA%\Bitcoin\testnet\bitcoin.conf