Photoshop Lightroom 4.1: "Keyset as registered is invalid" error during install

I received a genuine Adobe Lightroom 4.1 DVD with the purchase of my Samsung camera.
The disc contains the 64-bit and 32-bit versions of the software. I tried installing each one of them multiple times but the installation halts midway saying "Keyset as registered is invalid".
Any idea?
I'm using Windows 8.1 OS (64 bit, of course), 8 GB RAM, Intel Core i5 processor.
Thanks.

You might try using a download installation rather than the disk. You can use the serial number from the disk to activate the download.
Lightroom - all versions
Windows
http://www.adobe.com/support/downloads/product.jsp?product=113&platform=Windows
Mac
http://www.adobe.com/support/downloads/product.jsp?product=113&platform=Macintosh

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This document can help you to resolve system errors that occur while you use Adobe Photoshop Lightroom on Windows Vista. System errors can manifest in many different ways, including (but not limited to) the following:
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You must be logged on as an administrator to perform some of the procedures in this document.
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Beginning troubleshooting
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Intel Pentium 4 or equivalent processor
Microsoft Windows XP, Windows Vista, Windows 7
768 MB of RAM (1 GB recommended)
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CD-ROM drive
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Open Windows Explorer.
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If the Lightroom Preferences.agprefs file is still in the Documents and Settings/[username]/Application Data/Adobe/Lightroom/Preferences folder, delete it.
Empty the Recycle Bin.
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Move all the folders under the Users/[username]/AppData/Roaming/Adobe/Lightroom folder into a new folder on the desktop; name the folder Lightroom Presets. These are the presets that were installed with the application and that you created.
Move all the folders under the Users/[username]/Pictures/Lightroom/Lightroom Previews.lrdata folder into a new folder on the desktop; name the folder Lightroom Previews. If you have a large number of images, you can move this folder back to its original location before you open Photoshop Lightroom, once it's installed. Or you can delete this folders to re-create it when Photoshop Lightroom opens. If there are further problems with Photoshop Lightroom after it's installed, it might be due to corruption in the previews, in which case you need to delete this folder and re-create it.
Try to reinstall.Important: Do not delete the Lightroom Database.lrdb file!
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Copy the Adobe Photoshop Lightroom folder from the Photoshop Lightroom CD-ROM to the desktop.
Open the Adobe Photoshop Lightroom folder on the desktop.
Double-click the Adobe Photoshop Lightroom.msi file, and follow the on-screen instructions.
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Quit Photoshop Lightroom.
Rename the Lightroom Preferences.agprefs file (for example, to Lightroom Preferences.old) in the Users/[username]/AppData/Roaming/Adobe/Lightroom/Preferences folder.
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Choose Start, type msconfig in the Search text box, and press Enter.
Write down all unselected items under the Startup and Services tabs.
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Click the Services tab and select Hide All Microsoft Services.
Select Disable All then re-select FLEXnet Licensing Service. If you are unsure whether an item is essential, then leave it deselected (disabled).
Click Apply, and restart Windows for the changes to take effect.
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Follow the steps in task 8 above to disable startup items.
If Photoshop Lightroom autoplay displays, click Cancel when you are requested to Select the Language.
Copy the Adobe Photoshop Lightroom folder from the Photoshop Lightroom CD-ROM to the desktop.
Open the Adobe Photoshop Lightroom folder on the desktop.
Double-click the Adobe Photoshop Lightroom.msi file, and follow the on-screen instructions.
Click Change and select a different hard disk in the Change Current Destination Folder window. Click OK, and then follow the on-screen instructions.
Intermediate troubleshooting
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Quit all applications.
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Choose Start > My Computer.
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Advanced Troubleshooting
If the tasks in the previous section don't resolve the problem, you may be able to resolve the problem by reinstalling Windows Vista and Photoshop Lightroom, reformatting your hard disk and reinstalling Windows Vista and Photoshop Lightroom, or by determining if hardware is conflicting with Photoshop Lightroom.
Disclaimer: Adobe doesn't support hardware and provides these procedures as a courtesy only. For further assistance, contact the hardware manufacturer or an authorized reseller. If you troubleshoot hardware problems yourself, you may void the warranty for your computer.
Note: Before you remove or rearrange hardware, turn off and disconnect power to the computer and any peripheral devices.
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The built-in Administrator account has a higher access level to the system than a normal local administrator account. By default the built-in Administrator account is disabled. For information about enabling and logging in to the built-in Administrator account, contact your system administrator. You can also refer to this support document on the Microsoft support website: http://support.microsoft.com/kb/926183/en-us?spid=11737&sid=73.
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For instructions on performing a clean installation of Windows Vista, see document 918884, "How to install Windows Vista" on the Microsoft website at http://support.microsoft.com.
Note: Don't install additional software or hardware until you're sure that the problem is resolved. Don't back up the hard disk and restore Windows and Photoshop Lightroom instead of reinstalling them. If the problem is caused by an application or Windows, and either one is restored instead of reinstalled, the problem may recur.
After you reformat the hard disk and reinstall Windows and Photoshop Lightroom, try to re-create the problem:
If the problem no longer occurs, then install other applications one at a time and try to re-create the problem after each installation. If the problem occurs after an installation, then the recently installed application may be the cause.
If the problem occurs when only Windows and Photoshop Lightroom are installed, then the cause may be hardware-related, and you should contact the hardware manufacturer or an authorized reseller for assistance.
17. Check for problems with RAM modules.
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Change the order of the installed modules.
Remove all but the minimum number of modules needed to run Windows and [product], and test to see if the problem persists. If it does, replace the modules you removed and remove the others, testing again to see if the problem recurs. If it doesn't, then one or more of the removed modules are the cause. For assistance, contact the RAM manufacturer.

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I bought Adobe Photoshop Lightroom 4.1 cd-version today, but I've macbook air -computer and I can't use the cd - Would it be possible to install the software from internet by the code I have?

You should be able to download and install using the serial number from your disc...
Lightroom - all versions
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http://www.adobe.com/support/downloads/product.jsp?product=113&platform=Windows
Mac
http://www.adobe.com/support/downloads/product.jsp?product=113&platform=Macintosh

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I have recieved Adobe Photoshop Lightroom when I purchased my last camera, but the issue is that it is on a CD and I have a Macbook Air which does not have a CD-room.
Are there any other ways of installing this on my computer without having to buy the CD-room-attachment from Apple? Is it possible to insert some sort of code, as with the Works-package for instance?

You may download the product from below link
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Photoshop Lightroom 4.1: "Keyset as registered is invalid" error during install

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