My lightroom wont load because it had problems reading a cache. It says it will try to fix problem on reload but it doesnt. How do I fix this please.

My computer had a unexpected shutdown and it was while it was uploading pictures. Now its saying Lightroom encountered an error when reading from its preview cache and needs to quit. Lightroom will attempt to fix this problem the next time it launches.
I am a professional photographer and I have 2 weddings and 2 events that need to be edited very soon and I am worried about not being able to bring lightroom back up. Can anyone help please. I have tried relaunching several times with no luck. I have shut down the computer and restarted but again no luck. I have even upgraded from the lightroom 4 something to the 5.4 but still no luck. Please help anyone.

Step-by-step instructions:
1. find preview cache folder.
2. Close Lightroom
3. delete it (preview cache folder).
4. Open Lightroom
It's located in same folder as your catalog, which is a file whose name ends with ".lrcat". You can get the full path (folder & filename) by rolling over the text in the title bar of the Lightroom application frame (far upper left corner).
For example if your catalog was "Z:\Catalogs\GoodCat\GoodCat.lrcat" (do NOT delete your catalog ),
then your preview cache folder would be "Z:\Catalogs\GoodCat\GoodCat Previews.lrdata" - that's the folder you'd want to delete.
Don't delete anything else, but DO delete the entire preview cache folder.
To delete a folder or file, select it with your mouse, then press the delete key.
better?

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