When installing Digital Editions 3.0, installation stopped and I received this error:
Error opening file for writing:
\My Digital Editions\welcome.epub
Click Abort to stop the installation,
Retry to try again, or
Ignore to skip this file.
I completely uninstalled the previous version (2.0) before trying to install. Trying to reinstall 3.0 gives me the same exact error. A search of the Forums did not turn up a similar issue; I can't believe this is a unique problem.
Windows Vista Enterprise Service Pack 2.
3.00 GB RAM
Two 500 GB hard drives; neither one even 3/4 full.
I think I found my own solution to this issue. It seems to be caused by reinstalling Digital Editions after uninstalling an older version. Before trying to install the package again, I downloaded a fresh copy of the welcome.epub file. You can find this on the Adobe Digital Editions Home / Download Adobe Digital Editions page under Additional Downloads. It's disguised, so it reads Download Getting Started with Adobe Digital Editions (EPUB, 55 KB): http://wwwimages.adobe.com/content/dam/Adobe/en/products/digital-editions/assets/welcome.e pub.
Create -- if you don't have it already -- a folder under C:\Users\YourUserID\Docs\ (substituting your own User ID for YourUserID, of course) called My Digital Editions. Copy the welcome.epub file you downloaded into the new folder. It seems that since I moved My Documents to another drive, Adobe couldn't find its Getting Started book during the installation.
This work-around worked for me; no guarantee it will solve the issue for everyone.