I solved this problem
Finally i could restore an account than i couldn`t restore.
Those are the steps:
0.- Log into your account using shell access.
1.- Put the full backup into '/usr/home/cprestore' directory
(u can use wget to get the file if is in other server)
2.- Extract the file Full_backup_2005.....USERNAME.tar.gz
3.- Rename the created directory from Full_backup_2005.....USERNAME.tar.gz to USERNAME).
(mv Full_backup_2005.....USERNAME.tar.gz USERNAME.tar.gz)
4.- Delete the tar.gz file (the full backup u descompresed)
(rm *.tar.gz)
5.- Compress the directory, so u should get a file named USERNAME.tar.gz
(tar-c USERNAME.tar.gz < USERNAME)
6.- Move the file USERNAME.tar.gz to /usr/home directory
(mv USERNAME.tar.gz /usr/home)
Now, you have a directory into /usr/home/cprestore named USERNAME
and a file into /user/home named USERNAME.tar.gz
7.- Log into WHM and restore a backup from cpmove.
8.- Thats all, the account is created now without problems.
I dont know linux, my english is very bad, and i just use Cpanel since 1 week ago, so im sure there is another way to do this, but i finally restored the account with those steps.
Lucky !