I run Windows XP/SP2/HE. I have AVG for antivirus and, for spyware, I scan once a week, manually with Spybot & smart scan manually with Ad-Aware 2007 and Windows Defender. I have 2 questions regarding Windows Defender. 1) I run Defender using real-time protection and I have the Auto Start Option on. The Windows Task Manager shows that Defender is using a lot of resources at start up and the Defender help file actually says that Auto Start can slow things down. So, is there any real point in having the Auto Start option on and would stopping it be worthwhile? 2) More generally, with the protection that I have listed above is it worthwhile running Defender in real time or would my weekly scan be enough?