open up nautilus (file manager), make sure you're in your home directory.
CTRL H to see hidden files. Scroll down to a file called
.wine and delete that folder and it's contents. This will remove your wine 'home drive'.
In terminal (if you haven't got it already):
sudo apt-get install synaptic, which will install an advanced version of the USC.
Once installed, open it up and in the search box type
wine. Scroll down the list and tick
remove for every
wine item that has been ticked. Click apply, which will then completely remove the selected components.
Note: you must only remove anything that has wine in its name only.
From here you should be able to reinstall wine again, if required.
Hope that helps.