Does your boot manager allow you to modify the Linux boot parameters? If so, try booting in single user mode by adding the parameter 'single' to the boot parameters, which will get you a root user account without a password prompt. You can then use the passwd command to set a new password for your non-root account.
The other option if you have a bootable installation CD where you can mount your root partition as the root bot the cdrom boot, is to boot from that cd then when yuo get to the command prompt, use the passwd command as above.
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