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Are you a Windows user who has tried to export to DVD and gotten this message? "Disc Burning is not supported by lightroom on this computer."
There is a bug in the Lightroom 2.2 installer causing this problem. The only platform CD/DVD burning is not supported on export is Vista 64 bit.
To fix the problem try this:
By default this should extract the files to a folder (named Adobe) on your desktop. When the extract process is finished it will tell you "files are ready" and give you the option to launch the installer. Instead of launching the installer, uncheck the Launch box and check the Open the specfied folder box, then click Finish.
When the folder opens in Windows Explorer, double-click the Adobe Photoshop Lightroom 2 folder, then double-click the setup32.exe file. This is the installer for 32 bit versions of Windows (the bug is running the 64 bit installer by mistake). Follow all the on-screen prompts from there and choose the Repair option.
Hopefully that will restore the disk burning functionality for you.