Sansa m240 works fine with Vista, not with XP.

Uninstall/remove the mp3 player from the device manager of windows while its plugged into you computer and unplug afterwards from your usb port and plug it back in, windows now sees a new device and starts installing it.

Go to the configuration panel\system and click at the tab hardware and klik at the button device manager.

This should solve the problem.

Succes.

That model is not fully compatible with vista. So either it works or it doesn't. if not go back to using it on an xp machine.
Thanks,
lee

Uninstall all Sansa software using the add/remove programs function. Reinstall software from Sansa CD. Then and only then plug the mp3 player into the computer.

from SanDisk.SanSa 's menu--setting -- advance - USB,
select "MSC" mode.

it works for me at my XP2.

Try going into your USB Settings on your device and ensure the unit is set to msc

I have had the same probmlem but I've begun to realize that windows vista isn't compatible for the MP3 player when I tried using it with Windows XP -- and it worked fine.

to old for vista to recognize

Your M240 may have encountered a corruption in its Music Database, and may be corrected by formatting and updating the firmware. Try this: Manually switch the player to MSC mode and format through "Disk Management". Here are the steps: Step 1: Locate the "Hold" switch on the side of the M240 and enable it (you should see an "orange-colored" surface when it's enabled) Step 2: Plug the M240 to your computer (recommended Operating System is Windows XP and above) and check Windows Explorer if the player is detected as a "Removable Drive" Step 3: Open "Disk Management" by right-clicking on the "My Computer" icon, then selecting "Manage" Step 4: Your "Disk Management" window should be divided into 2 panes. On the left pane, click on "Disk Management" Step 5: On the upper right pane of "Disk Management", you should find the drive letter corresponding to your Sansa M240. The lower section also contains the drive # pertaining to your M240. Right-click on either drive letters pertaining to the M240 and select "Format". Follow the on-screen prompts. Make sure that the "Quick Format" checkbox remains un-checked. Step 6: In general, Disk Management is more the effective tool for formatting your M240 and assuming the format processing completed without any errors, proceed to updating the firmware of your player. Step 7: Use this link to download the Sansa Firmware updater: http://www.sandisk.com/Retail/Default.aspx?CatID=1376 Save this file to your Desktop and run it while your M240 is still plugged in to your PC. Follow the on-screen prompts. Step 8: "Safely remove" your M240 from your PC and -- with a fresh battery -- power on your player. It should boot up normally. I hope this works. The M240 is a great player

Youmust have instaled MEDIA PLAYER 10 , oderwise your computer will NOT see the device

Hi Nikki. Seems like the Operating System (is it Windows XP?) may have encountered errors loading the native drivers for your player when in MTP mode, or the Windows Media Player version on the PC your plugging your player in is Windows 9 or below. The minimum requirements of the M240 is Windows XP Service Pack 2 and Windows Media Player 10 or above. Falling short of this minimum requirement may cause your player not to be properly recognized. But assuming that the PC you're using the player with meets all the requirements, try to re-load the native driver by plugging your player to the PC and doing the following: Step 1: Right-click on the "My Computer" icon, then select "Manage". This will open the "Computer Management" window. Step 2: Left-click on "Device Manager" If your player is currently in MTP mode, then try this: (1) Left-click in "Windows Portable Device". You should find your M240 indicated there. Check for an error indicator on the left side of that icon. The error indicator would be yellow-colored icons displayed as "!" or "?" (2): Right-click on the M240 and select "Scan for hardware changes" or "uninstall". Both would have the same effect If your player is currently in MSC mode, then try this: (1): Left-click in "Universal Serial Bus Controller". You should find a "Mass Storage Device" there (make sure that the M240 is the only device plugged in to your PC at this time). Check for an error indicator on the left side of that icon. The error indicator would be yellow-colored icons displayed as "!" or "?" (2): Right-click on the "Mass Storage" and select "Scan for hardware changes" or "uninstall". Both would have the same effect Step 3: Unplug your M240 and plug it back in. This would force Windows to re-load the driver. 90-99% of the time, it would re-load the native drivers correctly. I hope this works.