It sounds like you need to send it into the shop to get if fixed. But first, to save your critical files, you will need to take the hard drive out and hook it up to another computer as "a slave" and then copy all of your files. There is an adapter that you will need to buy to hook it up to to a desktop computer. I don't remember what it is called, but perhaps your friendly local computer store would be able to help you with that.
If it is not under warranty, and if you want to try to fix it yourself, then you probably need to reinstall everything. Did it come with a pack of Installation CDs or a Recovery CD? If not, it is probably all on a hidden partition on your laptop. To access those files, you need to look in your start menu and look for a folder that has your manufacturer's name on it. In this case, it would be Dell. Somewhere in that folder, you should find a link that says something about restoring your laptop to the state that it was in when you bought it. This will completely format your hard drive and start you out fresh again--just as it was when you opened the box. HOWEVER, since it DOES format your hard disk before re-doing it, your critical files would be erased, so be sure to retrieve them before you do this.
Once you get your laptop working again, I would seriously recommend you buy either Acronis True Image or another good backup program and use it often. Then, the next time this happens, it would be easy to fix--by just running the backup program. If you want to partition your hard drive, the Acronis Disk Manager Suite is a good program too.
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