Lightroom won't launch

Hello,
When I try to open Lightroom, I am getting a message that reads "Lightroom encountered an error when reading from its preview cache and needs to quit." It states it will attempt to fix the problem next time it launches. I haven't been able to get the program to open for over three weeks. Does anyone know how to fix this problem?
It worked for over three months before encountering this problem.
I have a Dell with Windows 7.
Thanks for any help you can give.

Based on user suggestions and feedback we have updated our documentation on this issue with some new solutions.
http://helpx.adobe.com/lightroom/kb/error-unable-start-correctly-0xc00007b.html
We are locking this thread. If you have more questions or still are seeing the error, please continue the discussion on this thread: http://forums.adobe.com/message/4836005

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