Restore deleted account

the easiest is to recreate your old account. but you need to rename the deleted home folder back to what it was first before recreating the old account. this can only be done from terminal or from the root account. if you are not familiar with terminal then I suggest you do it from root. go to /System/library/coreservices. open directory utility.app. unlock the lock, go to the "edit' menu->activate root.
set a root password and log out. and the login window click on "other" enter root for user name. authenticate with the root password you just made and log in. then go to /Users and rename the old home folder by deleting "(Deleted) " at the end of it. then go to system preferences->accounts and recreate your old account. if you renamed the old home folder correctly it will say that a home directory by that name already exists and ask if you want to use it. say yes.

If there's not enough disk space then you need to move other stuff off the hard drive to make space or replace the drive with a larger one. You cannot operate OS X safely when you are running out of hard drive space. A minimum of 10 GBs of free space is needed.

If you've created a new admin account with the same username as the deleted account, then you can simply move all your files from the deleted account to the new one. Since the username is the same there will be no permissions problems. Also, since you are simply moving data from one location to another on the same drive there shouldn't be any space problems - nothing is being copied, just moved.

TM will restore the original user account so, yes, you will have a duplicate account - one that is active and functional and the now deleted account. However, if you do use TM to restore the old account, then you can delete the Deleted Accounts folder to provide the needed disk space.