I cannot remove a folder on my desktop

This is happening because you just copied the folder over from the other user. The system thinks that you do not have the right to delete is cause it is registered under that user. (which is gone now). The only think I can think of is to log in as an administrator under safe mode and try deleting it that way then rebooting. Tap the F8 key on boot up to access safe mode options.

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Assuming you have admin rights ...
Right click on the folder and select Properties from the menu.
Click on the Security Tab
Click on the Advanced button
A new window opens, click on the Owner Tab
Highlight Administrators
Add a check mark to Replace owner on subcontainers and objects
Click apply.
When it is finished, you should have full control of the folder. You should be able to open it, edit the contents or delete.