My website google search entry is messed up. In the preview in google search results, I get things like cracks, serials, random ip addresses. I scanned all files and my computer for viruses and malware and could not find anything. I also tried to download and reupload all content from a friend's computer and still that content persists. I also scanned the source code of all files, but the content does not appear in any file. Google also does not detect any malware on the website, as seen in their webmaster tools.
I have searched using the same keywords in other search engines such as bing and yahoo and the search results there are fine.
I am quite clueless as to what the causes would be for this and what would be a possible remedy.