You will get those indications even for a fresh install of IP products. Reupload your files and OVERWRITE everything except your conf_global.php. Recache your skins/language files.
Once you've reuploaded your files check for any security patches that IPS may have released since the date of your file and apply them.
Check your includeJS template in all skins to make sure nothing has been added. (You can normally do this by reverting the template if their have been any changes). If you find any then you will have to rebuild/recache your skins.
Check any third party hooks and delete any that are out of date or that you don't use any more.