Hello AstaLaVista,
Have you updated the Logitech drivers ?.
http://www.logitech.com/index.cfm/su...ads/downloads/
Also, is there a small icon for the sound card/speakers in the task bar ?, if there is try properties in that.
It's been a while since I've seen an XP desktop so this may not apply, but worth a look.
Good luck.