The iRiver T10 player is being sold with either MTP or MSC firmware,
depending on the country it originally comes from.
For MTP firmware, you'll need software Windows Media Player 10 or 11:
this software is installed when running XP SP2 or higher.
When not connecting with WMP you'll probably have the MSC version:
iRiver Plus3 software is needed for connecting this player (see below***).
Have a look in the player's System Info for knowing what firmware version is in the device: see the manual on page 55, page 29 in the pdf file. When not having the manual, go for a download to the Tech Support site:
In the bar [select a product], choose T10 from the list and click GO on the right, to get a view of all support for the T10.
Next select in the bar [select a category] Software&Driver and click GO
on the right. Updater for MTP devices and T series MSC drivers will show up: select the matching software and driver according to the previous check of firmware version.
When needing iRiver Plus3, click Plus3 in the page top of the support page or select next link: