Cisco 2821 router won't keep config

Hi
I have a cisco 2821 router that i'm trying to load a config on and for some reason it will not stay once i reboot it.
I can get the config on and give it a host name and everything that i need but when i reboot it goes back to
router> as the host name and no config on it.What would be causing this problem as this is my first time seeing
this before and thanks for your help in advance.

Check your config-registry using the "sh version" command.  It should be 0x2102 and you can change this using the command "config-registry 0x2102" and a reboot.

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    /* Style Definitions */
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    /* Style Definitions */
    table.MsoNormalTable
    {mso-style-name:"Tableau Normal";
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