iTunes stopped working on my Windows XP recently, is it that iTunes doesn't support XP anymore ?

Hey there -Poppy-!

Here is a link that can address your question:

Apple - iTunes - Download iTunes Now

http://www.apple.com/itunes/download/

Windows System Requirements

• PC with a 1GHz Intel or AMD processor and 512MB of RAM
• Windows XP Service Pack 2 or later, 32-bit editions of Windows Vista, Windows 7, or Windows 8
• 64-bit editions of Windows Vista, Windows 7, or Windows 8 require the iTunes 64-bit installer
• 400MB of available disk space
• Broadband Internet connection to use the iTunes Store

And here is a link that can help you troubleshoot your issue:

iTunes for Windows XP: Troubleshooting unexpected quits, freezes, or launch issues

http://support.apple.com/kb/ts1421

Thanks for using the Apple Support Communities. Have a good one!

-Braden