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Computer Help forum

General discussion

Windows Explorer not showing drive letters

by trapperyt / January 28, 2009 11:00 PM PST

Hello,
I have an Acer Aspire 3100 Notebook. A month or so ago it shut itself down and had a heck of a time restarting. At some point it corrected itself and now runs perfect.
Problem: since this incident, I no longer have the use of my USB ports.
If I plug in a mouse, mp3 player, card reader, etc.. they are obviously getting power, but the drive letters do not show in Windows Explorer, nor -in the case of the mouse- is there any input from the device itself.
Device manager of course, says all drivers are fine, but I updated and replaced them all anyway.
I have uninstalled USB controllers and rebooted to let them reinstall, but still nothing on the ports is working.
Can anyone suggest what the solution may be?
The only possible 'glitch' I can find is that the driver for the
PCI IDE Controller -ATI 4379 Serial ATA Controller - will not install properly. When trying to install, it says the "name is already in use"

Any help would certainly be much appreciated!
Thanks,
trapperyt

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Collapse -
windows explorer not showing drive letters
by QUEVOY / January 30, 2009 8:30 PM PST

same problem on acer 5050 3371 , maybe the the problem is we been hack.

Collapse -
Computer Does NOT recognize CD and DVD drives
by tosim42 / January 30, 2009 10:02 PM PST

Here is the fix. I've used this several times.
To resolve this behavior, follow these steps: 1. Start Registry Editor (Regedt32.exe).
2. Locate the UpperFilters value under the following key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
3. On the Edit menu, click Delete, and then click OK.
4. Locate the LowerFilters value under the same key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
5. On the Edit menu, click Delete, and then click OK.
6. Quit Registry Editor.NOTE: After you remove the Upperfilters value and the Lowerfilters value, if you notice lost functionality in a particular program, such as CD recording software, you may need to reinstall that software. If the problem recurs, consult with the software vendor for assistance.

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