[quote user="Leo Huang1"]I've tried looking for the InstallJammer Registry, but I could not find it, even when I turned on the option to view hidden folders[/quote]
It should be there. Note that if you are on a 64-bit machine, the path will be:
C:\Program Files (x86)\InstallJammer Registry\ccsv5
[quote user="Leo Huang1"]I can't change the work space because I can't even open CCS.[/quote]
Try going into the workspace folder and deleting the .metadata file. But BEFORE you do this, please zip up the .metadata folder and attach it to this thread so we can analyze it.
What version of CCS are you using? Older CCSv5 versions had issues with the uninstaller. CCSv5.5 should be fine.