Lost external drive after updates

I have had Windows 7 Pro for about a month (upgrade from Vista Ultimate). I installed some Win 7 updates this morning and after the desktop restarted, I lost an entire external drive. The dialog box told me that to use the drive I would have to reformat it.
I attempted to see if it work in my Vista laptop, but had the same results.

Can anyone tell me what happened and if this can be fixed without reformatting?

Thanks in advance,

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