ReadyBoost worked on my computer at the same time, but now it is not

When I first inserted an SD card in the Player embedded on my computer, the window open autoplay and I chose the my computer option acceleration.  At some point during the past year, I don't know when, readyboost stopped working and the AutoPlay window does not open when I insert the SD card even.

Some other facts:
-placed in another same SD card opens the AutoPlay window Vista machine and readyboost will not work.
-I set AutoPlay 'ask me' for every single option
-I have no specific choice in autoplay for "extra memory" or "SD card" or 'external drive' or 'storage device' option which seems to be specific to my situation.
-When I check the properties of the SD card on my computer, I don't have a tab for the sharing or readyboost (that's why I say that readyboost does not) and there is no other way to put on that I can find
-I went through the troubleshooting autoplay and turned on via the command prompt.  I know that it is enabled because the second time I went through the process that I received a prompt that says it was already running.
-I went though the process running, check each file and it does not appear that anything running that could interfere with autoplay.
-Autoplay works fine for CD, DVD, etc.

I don't understand why different properties of the SD card even on separate computers and why mine does not have the readyboost option.  I'm stuck, and if someone has a preview of this, I would greatly appreciate your help.

Thank you-

Hello

Click Start, type Autoplay and press to open the dialog box. Check the stock for the SD under devices down. This defines what the system does with him when it is inserted. Good luck, Rick Rogers, aka "Crazy" - Microsoft MVP http://mvp.support.microsoft.com Windows help - www.rickrogers.org

Tags: Windows

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