Internet Browsing: Firefox
Word processing: WordPerfect 2000, Word 2000 if I have to work with the computers at school on the same document.
Text editing: TextPad
Audio Playing: Winamp
Ripping/Burning: Easy CD Creator 4
Video playing: Windows Media Player
Instant Messaging: MSN, Trillian only for using MSN on two accounts at the same time , Y!M When I can bothered (almost never)
Filesharing: I have KaZaA installed, but the spyware components got deleted
Image creating/editing: Photoshop 6.0, ACDSee for viewing and simple things like cropping if I don't want to wait for photoshop to load.
Virus Scanning: AVG Virus scanner
Spyware detection: AdAware
Software Firewall: ZoneAlarm
File Archiving: WinRar / WinZip

Hopefully I'll be getting Flash soon as well, and I would like to get Finale or Sibelius for Music stuff too.