As used on Windows XP Professional, no surprises perhaps but have found the following to be extremely useful:

Ccleaner – clean up utility: http://www.ccleaner.com/download

Thunderbird email client – http://www.mozilla.com/en-US/thunderbird/

Photo organising – Picasa2 http://picasa.google.com/

Syncbak – I use for file backup – http://www.2brightsparks.com/syncback/syncback-hub.html, but note the free version will not manage locked or open files.

Startup Optimizer – http://www.shareup.com/Startup_Optimizer-download-47143.html

Anitivirus – http://www.free-av.com/

Voip Skype – http://www.skype.com/

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