Trouble Opening Lightroom

Hi there,
I have Lightroom 3 and recently when I was trying to open it, it gave me the error message: "This Beta version of Lightroom has expired. The application will now quit." I did try the Beta version of Lightroom 4 a while back, but today is the first day I have recieved this message. I now can't access the Lightroom that I own.
Anyone else have this problem?

Downloading an update wouldn't cause a program to disappear from your computer.
The only way I know of for programs to disappear is if they are uninstalled (by the user), or the user has accidentally deleted/moved/renamed the appropriate folders.
But seriously, we need to have an answer to Keith_Reeder's question: Which operating system, please?
If you own a copy of LR3, and you can locate your serial number, then all you need to do is download Lightroom 3.6 from Adobe, install it, and run it.

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my computer crashed last night while I was using Lightroom. Since then I cannot re-open the program to resume work. I keep getting the following message: "The Lightroom catalog names "Lightroom 4 Catalog" cannot be opened because another application already has it opened." Can some one please help me to resolve this issue?

Navigate to where your Lightroom catalog is. If there is a .lock file there, delete it.
Normally the lock and journal files are deleted on exit. The lock file is there to prevent several instances of Lr opening at the same time.
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Once a new version of Photoshop comes out Adobe does not support updating ACR from the older version of PS.

Having Trouble Opening Catalog

I recently subscribed to the Adobe Creative Cloud. When the new LightRoom CC was announced, I upgraded to that from my older LR 4. Now I am having trouble opening the LR Catalog. The box that pops up says it is note writable and cannot be opened. A message under that says it could be caused by incorrect permissions. Help with figuring this out would be much appreciated.
My computer is a PC. I also tried opening a different catalog, getting a message that it needs to be upgraded. I complied, and it opened it. Then, when I went back to open the most recent catalog, it would not open. I looked at the permissions, tried to see if anything looked out of order. But I am not sure what is right and what is wrong!
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<moved from Adobe Creative Cloud to Photoshop Lightroom>

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http://www.adobe.com/products/photoshop-lightroom/tech-specs.html

The error message is (0xc000007b) comes up when I try to open Lightroom 3.

Having trouble opening up light room, it is giving me an error message on it
Message title was edited by: Brett N

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

Can't open Lightroom. Getting Error message: Trying to open Lightroom. Get ERROR message

I can't open my Lightroom. I keep on getting the message:
Trying to open Lightroom. Get ERROR message:
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This has happened before.
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I apologize. I should've told you to delete the folder with the same name as your catalog. So you want to delete the folder named Lightroom 5 Catalog Previews.lrdata.

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When I attempt to open lightroom I recive this message: [ Lightroom encountered an error whenreading from itspreviw cache and needs to quit.Lightroom will atempt to fix this problem next time it launches.] I did this a few times but no resoulve

When I attempt to open lightroom I recive this message: [ Lightroom encountered an error whenreading from itspreviw cache and needs to quit.Lightroom will atempt to fix this problem next time it launches.] I did this a few times but no resoulve

It isn't a file, it's a folder. It will have the same name as your catalog, but will have the extension data. It will be in the same folder along with your catalog. If you need to use the search feature to search for *.lrdata.

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Open the folder containing your catalog. In that folder you will find another folder with the extension .lrdata, and you need to delete that folder. After you do that, Lightroom should start normally and will create a new preview cache.

Can I open Lightroom without upgrading my catalog?

Unfortunately I'm not sure how to do a screen capture, so I'll try to type what I'm seeing.
When I click on the LIghtroom icon, I get a message box that says "Please upgrade the catalog file "Lightroom Catalog 3" for use with Lightroom 3. It continues "Lightroom will create a new catalog file in the destination indicated below. The previews will also be moved to the location and converted for use in Lightroom 3" Upgrade destination C:/Documents and Settings/...../Lightroom 3 Catalog-7.lrcat
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My concern with upgrading is that I've a workflow for the catalog that's at C:/Documents and Settings/..../Lightroom 3 Catalog-5.lrcat Earlier today, I clicked on the dialog that resulted in a catalog at Lightroom Catalog-6.lrcat, but when I opened it, I'd lost all the listings for the Free Agent drive (usually G:/ where I do my daily uploads. I could still see the external hard drive (E:) where I save edited work, but it indicated that I would have to locate all of the folders I'd created on the E: drive. I saw only the default collections on the left hand side -- (smart collections, last month, etc.).
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Lightroom 3 Catalog 5.lrcat works fine for me. My default for backing up is whenever I close the program, so I'm confident in it's integrity. How can I open Lightroom with the catalog that works for me --without getting messages that seem to force me to do an upgrade I don't want to do.
Thanks for your help!

I've been using Lightroom 3 for about a year. Right now I'm going
back to the folder with my backups and opening Lightroom 3 Catalog-5. I
think I've tried to reconstruct my left side panel with earlier
Lightroom 3 Catalog x versions. I don't have all the collections and
folders I had with my Lightroom 2 catalog. That catalog seemed to
have been corrupt when I moved to Lightroom 3. I don't recall how I did
it, but I guess I imported the photos and tried to start over with my
collections.
Jan

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Back up all data.
Triple-click the line of text below to select it, the copy the selected text to the Clipboard (command-C):
/Library/Internet Plug-ins
In the Finder, select
Go ▹ Go to Folder
from the menu bar, or press the key combination shift-command-G. Paste into the text box that opens (command-V), then press return.
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~/Library/Internet Plug-ins
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