Locked out, password no longer works.

Hi, I have Ubuntu 14.04 and I made some symlinks for wine, which it kept deleting, thus stopping me being able to install programs.
So with my limited knowhow, I tried to change the attibutes for the symlinks, to stop them being deleted, which came up with an error.
One of the symlinks made my directory /home/paul/ into drive d:
After this the symlinks could no longer be accessed so I deleted them.
Now I can no longer get into Ubuntu, it comes up and asks me for a password, but refuses my password as incorrect, even though I have used this thousands of times under sudo.
Is the system screwed and requires a new install, or is this fixable?
Thanks, Paul.

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