Help on error Notice on Modules page
This seems to be related to this issue and there is available patch file for Drupal 7 and UTF-8 file encoding.

So your options are:


Disable the notice in site settings or in PHP configuration.
Wait until patch is committed and upgrade your Drupal core.
Disable faulty module.
Apply the patch your-self.
Apply patch manually by opening it and check the changes:

--- a/includes/common.inc
+++ b/includes/common.inc
@@ -7369,7 +7369,8 @@ function drupal_parse_info_format($data) {
   $constants = get_defined_constants();

   if (preg_match_all('
-    @^\s*                           # Start at the beginning of a line, ignoring leading whitespace
+    @^(?:\xEF\xBB\xBF)?             # Check for UTF-8 byte order mark and remove it
+    \s*                             # Start at the beginning of a line, ignoring leading whitespace


where on the top is the file to edit which is includes/common.inc (ignore a/b), 3rd line is the line number, then remove the lines which starts with minus and replace them these with pluses (without plus signs). If you got the error, then double check your syntax or revert your file to the previous version.