See the FAQ here - http://www.sansa.com/support/sansa_view/faqs
The most common reason for this problem is not having the latest
Windows Media Player installed, or having a Windows OS version that is
not supported by the Sansa player.
The Sansa players support Windows XP SP2 and Windows Vista and
above. If your operating system version is supported by the Sansa
player:
SOLUTION 1 – Download and install the latest
Windows Media Player
SOLUTION 2 – If that didn’t help, and you are running Windows Vista, apply the following hotfix -
KB940199
SOLUTION 3 – If that didn’t help, download and Install the MTP Porting Kit (
click here)
SOLUTION 4 – If that didn’t help, try connecting the device to the PC using MSC mode
View/c200: Turn on & press and hold the rewind button while plugging into the PC
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