Device Manager not working in Windows 7

Hi,

Remember to set the MP3 to MTS if you want to sync with Windows Media Player and to MSE if
you want to use the MP3 as if it were a drive.

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Use these methods in reverse to check if something is disabled causing an issue.

How to troubleshoot a problem by performing a clean boot in Windows Vista or
Windows 7
http://support.microsoft.com/kb/929135

How to Change, Add, or Remove Startup Programs in Windows 7
http://www.sevenforums.com/tutorials/1401-startup-programs-change.html

Autoruns - Free - See what programs are configured to startup automatically when your system
boots and you login. Autoruns also shows you the full list of Registry and file locations where
applications can configure auto-start settings.
http://technet.microsoft.com/en-us/sysinternals/bb963902.aspx

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Did you disable any Services? Check them at BlackViper and set ALL back the defaults.

BlackViper - Windows 7 Services
http://www.blackviper.com/Windows_7/servicecfg.htm

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Set the MP3 to MTP Mode for Sync to WMP11/12 - MSC mode to treat the MP3 as a drive.

Sansa MP3 Forums
http://forums.sandisk.com/t5/Sansa-MP3-players/ct-p/mp3

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If needed :  (references to Vista also apply to Windows 7)

Tips for solving problems with USB devices - and a Mr Fixit
http://windowshelp.microsoft.com/Windows/en-US/Help/c39bd203-f729-47a4-8351-83291e13c8a81033.mspx#EGB

Hardware devices not detected or not working - Mr Fixit
http://support.microsoft.com/gp/hardware_device_problems

Make sure Windows is updated as it should be as there have been several USB updates.

This part is for MSC mode using the MP3 as a drive.

1st check that the driver letters for them, for a player if the default player drive letter is changed
this happens. Mine was H: and I added a device which took H: and the player stopped. So I set it 
back to H: and the other device to J: and all worked again. If needed Start - type in Search box ->
Disk Management   find at top of list - Right Click on it - RUN AS ADMIN

Be sure to remember the MP3 has to be set to MTP for synching with WMP and to MSC to copy and
delete files and updating firmware.

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If no joy do this:

You may need a powered hub. (all the USB ports on your computer are not powered either, often
only 2)

try these :

Make a Restore Point

Control Panel - Device Manager - click in the blank area - then VIEW - Show Hidden Devices

Your devices here are the MP3 player(s).

now look everywhere EXCEPT USB Controllers for your devices (may not find ANY) and if you find
it RIGHT CLICK and UNINSTALL them all.

now go to USB Controllers and UNINSTALL EVERYTHING in the category but the category itself.

APPLY/OK

REBOOT

This will refresh the USB stack and hopefully allow the device to install. (You may need a powered hub)

Here is the similar procedure in XP, Windows 7 is the same except we need to clear the specific
devices if present.
http://support.microsoft.com/kb/310575

Here is a utility to help but do the above 1st.

USBDeview is a small utility that lists all USB devices that currently connected to your computer, as
well as all USB devices that you previously used. Run it Options and check the 1st three choices to
see if any are there.

http://www.nirsoft.net/utils/usb_devices_view.html

You would remove all instances of the devices then reboot.

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If the above does not work (and it should be considered preparatory work).

This does work for any MP3 when the USB stack is not corrupt :

1st Remove Player and Reboot Computer - Switch to MTP mode on your MP3 Player

Does not matter what brand MP3 you have

1. Check this Just In Case

http://kb.sandisk.com/app/answers/detail/a_id/42/kw/e200*/page/2/r_id/101834

2. Do this (web page as reference)

http://kb.sandisk.com/app/answers/detail/a_id/192/related/1/kw/e200*/page/2/r_id/101834

In XP : Start - RUN - CMD

In Vista/Windows 7 : (do it this way!)

Start - type in Search box -  CMD   find at top of list -  RIGHT CLICK  -  RUN AS ADMIN

Copy and paste this command into the XP or Vista/Windows 7 CMD windows - hit enter

Net localgroup Administrators local service /add

3. Then follow these :

http://kb.sandisk.com/app/answers/detail/a_id/139/related/1/kw/e200*/page/2/r_id/101834

Hopefully your MP3 is working now.

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Only if needed :

Try a System Restore back to before this happened :

How to Do a System Restore in Windows 7
http://www.sevenforums.com/tutorials/700-system-restore.html

Hope this helps.