1. Go to program files and delete the foxit directory
2. search you computer for 'npFoxitReaderPlugin.dll' and 'FoxitReaderOCX.ocx', delete any copies of them that you find.
3. Install Adobe Acrobat Reader. (now just adobe reader); it will automatically reclaim all associations previously taken up with foxit
4. Install your PDF viewer of choice (SumatraPDF recommended) and set it to be your default PDF viewer. Any association that your PDF viewer fails to claim (because it is not as intrusive) will fall back to acrobat reader.