1) First of all, avoid double-posting, you asked exactly the same question in two different posts.
2) I already had this kind of problems, usually you should not use phpmyadmin to import, you should import with the application (here wordpress) restore tools.
The reason is that the data are exported with the database NLS settings, and phmyadmin imports them with your PC's settings or with the defaut NLS settings.
And, of course, the National Language Settings are set at the database creation, you cannot modify them in config.php or inside the tables.
The only thing you can try doing is creating a new database with the same database settings and import your backup, and see if this works. Then you will know how to re-create a brand new wordpress install from scratch and import your backup.
3) By the way, this is the first basic thing you have to learn when you administrate a database : you must know how to restore your backup from scratch, in case of big trouble. usually people test that in a completely different environment (may I suggest your own PC), and you have a lot of time learning while your real site is up, and you are ready if it happens to crash.
4) Of course, all of us are here in order to help you, but it's a several-step process and you are in a hurry, so please keep us informed with your progresses and try avoid stressing yourself...
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