I have two Dropbox folders on my computer

At this point I would suggest that you unlinked your comcast account and login using the gmail credentials deanefelter. 

Follow these steps to unlink a computer:

1) Right-click the Dropbox icon in the system tray, or menu bar, by the clock
2) Click on the gear icon in the Notifications panel and select 'Preferences' > 'Account'
3) Click the 'Unlink' button
4) Afterward, Dropbox will prompt you to re-register. You will now be able to link your gmail account. 

Note that the Dropbox folder itself is still there. Since you'll be relinking to a different Dropbox account, the application will detect that another Dropbox folder already exists on the computer, and will give you two options: 'Choose Another Location' or 'Install'.

If you want your new Dropbox folder to be in a location different than your existing folder, click on 'Choose Another Location'.

If you want your new Dropbox folder to be in the same location as your existing one, click on 'Install'. This will rename the existing Dropbox folder to 'Dropbox (Old)' and will create a new Dropbox folder for the account you’re currently linking. 

Should you like to transfer your files from one Dropbox account to another, the easiest way is to share a folder between your accounts. Add the files you'd like to transfer to this folder and they will automatically sync with your other account.

We've outlined the specific steps for you here:

https://www.dropbox.com/help/files-folders/move-files-between-accounts

Let me know if you need any further assistance and note that I removed your email addresses from your last post for security purposes.