You can save your workspaces to a separate folder before deleting preferences if you want to save them. I do the same thing with my custom Snippets folder. Go to...
C: > Users > (username) > AppData > Roaming > Adobe > Dreamweaver CC 2015 > (language) > Configuration
Make a copy of the Workspace folder (or just the named workspace .xml files you want to keep). You can do the same with the Snippets folder too.
Then, after you restore the prefs, you drop them back into the Configuration folder. Saves a ton of time on reorganizing things after DW bombs beyond workarounds.
