When attempting to open LR 5, LR encountered error when reading preview cache and needs to quit. LR will attempt to fix on next launch.  LR does not fix on 30 attempts, and I cannot use LR. Windows PC. I have done

LR simply cannot be used by me now, I constantly get the error message, and I cannot open LR.
I have downloaded the LPP files and installed to .exe.  I have uninstalled LR and then reinstalled LR.  Still the same issue.  PLEASE HELP.
Thanks.

You have a corrupt preview cache, that's what the message is telling you. To fix, you need to delete the current preview cache (Lightroom will start to rebuild a new one when you then start it). To delete the cache, use Finder/Explorer to go to the folder that contains your catalog. In the same folder will be the file named the same as the catalog but will end in Previews.lrdata, e.g. it will be something like "Lightroom 5 Catalog Previews.lrdata". Delete this file (taking care NOT to delete the file ending with ".lrcat"), then Lightroom should start OK.

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