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You need to be much more verbose about "LR won't open at all".
What OS and version are you running?
When you start Lightroom what happens?
Any error messages?
To correctly use a catalog backup file, you need to unzip it then copy the LRCAT file to a new location, for example near the location of your not-working catalog. You should never attempt to directly use any catalog backup in the backup folder tree.
I'm sorry I didn't give enough information. Yes, there was an error message, which I failed to write down or photograph (something I'm doing more and more as issues pop up). It couldn't find my most current catalog, so it wouldn't load at all.
I'm running Windows 7, 64-bit.
I was on the phone with Adobe for 90 minutes, while the tech tried various things, including new AMD driver updates (which took 30 minutes).
I thought I was up and running, and was working within LR, but it just crashed after yet another "Not Responding" error message.
Also, must I/is it best to keep the LR catalog and/or backup on my C drive? I asked the Adobe tech that question several times, but because of a language barrier, he never satisfactorily answered my question.
Your catalog can be located on any local hard drive (internal or external); no network drives allowed.
Your photos can be located any where.
It is best that your catalog backups and your catalog are not on the same drive so that one drive failure does not take it all at once.
Thanks for the info, ManiacJoe. I appreciate it!