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I have been using lightroom 4 for a while with no problem now it wont open up and error message 0xc0000078 comes up. I have rebbooted reinstalled etc. I installed version 3 and that worked when I upgraded version 3 to 3.6 I had the same problem.
Good day all,
Based on your 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
Let us know if this helps, or feel free to post if you have more questions or still are seeing the error.
Thanks!
Pete
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Look at my posting 95. You will see that I had same without Livid installation recently and just did the reinstal, which led to the question 'Repair Installation?', to which I simply replied 'yes'and all was fixed.
Good luck.
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nobby c, have you tried the instructions in that technote above?