Anti-Virus: Avira
Web Browsing: Firefox
Email: GMail, Hotmail
Music & Video: Songbird, Winamp and VLC
Office Suite: Office 03
Graphics suite: Paint (lol)
Image Browser: Default Win7 Image viewer
Web Authoring: EditPlus or Sublime Text
Defragging: Auslogics Defrag
System tools (File & Registry...