unable to uninstall Big Al's Flexible PayPal Pro p

Hi

I bought and installed Event booking on SAturday and then bought Big Al's Flexible PayPal Pro and installed what I thought was the correct version. I turns out I erronously installed the Joomla 1.5 version instead of the 1.6 version, sio I need to uninstall it and reinstall the correct version.

In the events booking plugin area I am unable to uninstall this paypal plugin it gives me a pop up box message 'Payment Plugin Management' and the message 'Could not load xml file' at the top of the page in blue.

Can you assist me to uninstall this plugin please?

many thanks
Elizabeth