Google has listed my site as containing malware

My site is now blocked from Google – it says that my site contains malware. I have always used the latest version of wordpress. To fix the problem, I deleted all of the files, uploaded the latest version, 2.71, and reinstalled my backup. It was still blocked.
I worked with my host site to see if they could see it from their side and I went through every single file page looking for script, but neither could find anything. So I switched host sites, uploaded an entirely new site, changes all passwords and only installed the backup file. I then went to http://www.stopbadware.org – the site that monitors for google – and they ran a scan. They informed me that the file: http://www.darylpevetoblog.com/wp-includes/js/jquery/jquery.js?ver=1.2.6 contains bad code. I matched it line for line with the download from wordpress. I am confused. Is my site hacked or is there a problem with wordpress? And how do I fix this?