I river t20

Go to the mfr.'s website; I'm fairly sure you can download a copy of the lost CD to your system and burn a new one locally.
You can download the manual here:
iRiver manual

IFP-790 can be accessed in UMS and Manager mode:

UMS mode
For firmware upgrades iriver PLUS3 must be used.
Download iriver PLUS3 going to this site:
http://www.iriver.com/index.asp
Click Support on the left side.
Select Download in the second column.
Select "Download iriver PLUS3" in the page: allow download (when blocked / sometimes download has to be repeated).

The size of the iriver PLUS3 download is 59.3 MB.
iriver PLUS3 can also be used for music transfers in UMS mode.


Manager mode
For Manager type connection the iriver music manager must be downloaded and installed.

Go to the support site:
http://www.iriver.com/index.asp

Select Support in the first column.
Download in the second column.
Enter the phrase 'music manager' and click GO:
download 'iriver music manager (Ver 3.21)' [ 28 MB].

This product is compatible with iRiver's Plus3 software. Visit:
  http://www.iriver.com/

and click on the 'Plus3' heading on the left. This will give you a brief guide to the software and a link.

This website is quite slow and poorly designed, so be patient.

I had the same problem. I reinstall windows media player 11 and now the system recognize my iriver T20!!! When reinstalling WMP 11 i had T20 in the USB Port!
Angel Greece

Make sure you have the latest version of Windows Media Player. XP has all the right drivers but the iRiver needs to synchronise with Media Player inorder to transfer music onto the player using the sync function. Get Media Player 10 or higher then plug the iRiver into the computer.

XP should display it as a drive in "My Computer". It may require a firmware upgrade. This can be downloaded from T20 Firmware Upgrade V1.71

No Guarantees....Hope this helps.

Make sure you have the latest version of Windows Media Player. XP has all the right drivers but the iRiver needs to synchronise with Media Player inorder to transfer music onto the player using the sync function. Get Media Player 10 or higher then plug the iRiver into the computer.

Try this: disconnect the player from the computer, turn it off Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.

All the info/manuals/drivers/upgrades for the iRiver T20 can be found here:
http://www.iriver.com/product/p_detail.asp?pidx=71

Try this: disconnect the player from the computer, turn it off Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.

All the info/manuals/drivers/upgrades for the iRiver T20 can be found here:
http://www.iriver.com/product/p_detail.asp?pidx=71

iriver.com has all the software availble to make it work on your p.c. Go to the website and search ifp-795. Download and install the software, you should be fine. You might be prompt in the instalation process... remember "install or continue anyway" good luck.

Try this: disconnect the player from the computer, turn it off Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.

All the info/manuals/drivers/upgrades for the iRiver T20 can be found here:
http://www.iriver.com/product/p_detail.asp?pidx=71