Hi there,
Do you have the output from the command - IE any errors reported. You probably dont want with recovery because as soon as you issue a command using WITH RECOVERY you can no longer restore any future differential backups. If you need access to the database then I would suggest using WITH STANDBY=<undofile> which will put your database in a read only state but not allow it to be changed so you can restore future differential backups.
Let us know if this helps otherwise post the error messages you see when you run the command.
- James