Applied an Optional Hardware Windows Update on Dec 18th for genesys
Genesys USB Mass Storage Device. Went away on vacation after powering
off the computer, came back and couldn't read from the reader. Went
into Device Manager and it had an ! or ? next to Genesys USB Storage
Device. Tried doing a rollback but that didn't work. Multiple installs,
disables, enables, rediscoveries, etc failed. Continued to receive
error 19 or error 10's.

Did some searching on the Internet and found out that a mid Dec update
caused the issue. Checked Windows Update History and Dec 18th the
Genesys device driver was the last one installed. I needed to use
system restore to prior to it and it again works.

I don't remember the card reader manufacturer (might be a CompUSA
branded model) but on the bottom is listed:
9 In 1 Card Reader
Model No: CR-V10-U29G

Here's links to other postings about the exact same issue starting
after the update was listed on the Windows Update site mid December:
http://www.computing.net/hardware/ww...rum/40028.html
http://forums.hexus.net/showthread.php?t=63059

Without doing the update (which I've now hidden), Device Manager lists
USB Mass Storage Device vs the Genesys USB Mass Storage Device it lists
after the Windows Update.

It's either incorrectly identifying and replacing a device it shouldn't
or the lastest Windows Update for that device is not compatible with
all devices which used the previous driver.