A manual for the T30 can be acquired going to next link:
In the bar "select a product" select your player and click GO on the right side. All support for this player will be viewed.
T30 English manual link will show up in the list. On the next page you can download the zip file for either iRiver Plus2 or Windows Media Player.
Not sure if the T30 will work with Windows 7.
It depends on the firmware you have in the player.
Normally Windows Media Player should detect the T30 in MTP mode.
When having firmware that only detects the player in MSC mode, seeing the player as a removable disk: there are MSC drivers available under software&driver ( T30umd.inf ), not sure if they'll work on Windows 7.