Every time I start my laptop, running Windows XP, I get the message "A system change was made by a known application. Change Type: Application Registration. Application - C:\program files\Windows Defender\MpCmdRun.exe". Do I need this?
Defender was initially released as a beta version for XP, many moons ago, and I recommended it to everyone as a freebie from Microsoft! 12 Months later I came to a (semi) rapid conclusion that it actually did nothing, caught nothing and therefore am still removing it systematically from friends machines. It had better not be in Windows 7 otherwise I`m going to complain to the European Courts!