I installed Norton Internet Security 2011 on Windows 7. When clicking the Windows Media Player desktop icon, nothing happens. Loading a mp3 file on windows explorer displays an error saying "server execution failed" and the WMP does not run. Also, a website I use a lot does not display correctly on IE 32bit but works ok on IE 64bit. I tried re-installing WMP in the Programs and Features but this still doesn't fix the error. Recently I installed the lastest version of Avast anti-virus and exactly the same issue happend with WMP and IE. This was fixed by restoring to a earlier Norton Ghost image without Avast installed.