They're in your user profile, and hidden by default. See Replace Your Preferences for the paths.
To make them visible, open Windows Explorer, then Tools > Folder Options > View tab and set the radio button to show hidden files and folders.
I have revealed the hidden folders and followed the folder paths with my own user names but I still cant find the preferences folder do delete.
You might not have permission for ID to even write them to start. Check the permissions on the parent folders and make sure both your user and System have full control. Then create a new user, reboot and log in with that account and launch ID. If successful, go back to the original account and copy the two folders from the new account and replace the ones in the original account (If they exist, rename or delete them. You need to replace, not merge, the folders).