To get support on Piwik itself please have a look at http://piwik.org – I’m quite sure they can help you.
I don’t think Piwik itself screwed anything up… maybe you mixed up the directories or databases? Just put Piwik in an own folder and create an own database for Piwik. Then it should not affect any other hosted applications.
I know I screwed something up. Sadly code and all this stuff confuse me. I know it is wonderful and people like you can probably make it look like rain falling but to me it is Greek and I understand nothing. I have searched and searched for a stats plugin. The one I was using placed ads for visitors to see. So it was removed. I will try and find someone to install the Piwik for me. That would be easier than me playing around and screwing something else up again.
thanks for your help. If/when I get Piwik installed I will comeback and download this plugin.