OS: Windows XP Professional
Browsing: IE6
Music: Winamp 2.7
Chat: MSN6 / IRC
Word Processing: Notepad / Wordpad (w00t, retro!)
Graphics: PSP7 / Adobe Photoshop / Good ol' PAINT!
Antivirus: None... come on, I dare you
Spyware: SpyBot S&D
Firewall: None... feel free NOT to h4x0r me back to the stone age...
File Sharing: None... my piracy is strictly between friends
FTP: RightFTP
Video playback: I leave it up to Windows to decide.

I also find use for the following:
Multisim 7, CommSim, Ultiboard, PCB Layout32, A8031/52 Emulator & Assembler... but now we're getting into hardcore nerd territory, so I'm stopping there