Limited with suggestions until you can upgrade away from Windows XP SP3.
If you don't use any Windows-only programs than have you looked Ubuntu or other Linux distros?
Planning to buy a new PC or Mac? Or can you current system handle a newer OS?
I don't think McAfee Security Scan Plus is a realtime AV. Replace it with a good free/paid AV.. I will also suggest your Sandboxie and MBAE since XP wont be getting any future updates.