Flash Drive won't Open after Yosemite upgrade

I recently updated my MacBook Pro 13' to OS X Yosemite. I went to pull some files off of my 16 GB SanDisk Flash Drive and I couldn't get my Mac to recognize it. I was able to open it before the upgrade. The flash drive does show up in Disk Utility, but that doesn't allow me to open it. Any help would be appreciated. Thanks!

I just had a scheduled call with apple support. I showed the representative via screen sharing the error message and the accompanying comments I receive each time when I try to open my Kingston DTVP password protected flash drive. His take on it was that the driver software of my flash drive is not compatible with Yosemite. In theory I have two options:
1 - Upgrade the driver software of my flash drive. I suspect there is only a slight chance that this is possible given that Yosemite is so new so Kingston probably doesn't have an update yet. (I will check with Kingston but their technical support is not open on weekends.) Unfortunately replacing my flash drive is not an option because my employer allows only 2 password protected models to be used on company computers.
2 - Downgrade to the previous operation system (I think it's called Mountain Lion) which I cannot do myself because I don't have TimeMachine on. If I want to do this, I most likely will have to pay for apple support.
I have a MacBook Air 13-inch, purchased in June 2013.

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