Index: typo3/sysext/setup/mod/index.php
===================================================================
--- typo3/sysext/setup/mod/index.php	(revision 7568)
+++ typo3/sysext/setup/mod/index.php	(working copy)
@@ -303,9 +303,43 @@
 		if ($this->isAdmin) {
 			if (t3lib_div::_POST('deleteInstallToolEnableFile')) {
 				unlink(PATH_typo3conf . 'ENABLE_INSTALL_TOOL');
+				$installToolEnableFileExists = is_file(PATH_typo3conf . 'ENABLE_INSTALL_TOOL');
+				if ($installToolEnableFileExists) {
+					$flashMessage = t3lib_div::makeInstance(
+						't3lib_FlashMessage',
+						$LANG->getLL('enableInstallTool.fileDelete_failed'),
+						$LANG->getLL('enableInstallTool.file'),
+						t3lib_FlashMessage::ERROR
+					);
+				} else {
+					$flashMessage = t3lib_div::makeInstance(
+						't3lib_FlashMessage',
+						$LANG->getLL('enableInstallTool.fileDelete_ok'),
+						$LANG->getLL('enableInstallTool.file'),
+						t3lib_FlashMessage::OK
+					);
+				}
+				$this->content .= $flashMessage->render();
 			}
 			if (t3lib_div::_POST('createInstallToolEnableFile')) {
 				touch(PATH_typo3conf . 'ENABLE_INSTALL_TOOL');
+				$installToolEnableFileExists = is_file(PATH_typo3conf . 'ENABLE_INSTALL_TOOL');
+				if ($installToolEnableFileExists) {
+					$flashMessage = t3lib_div::makeInstance(
+						't3lib_FlashMessage',
+						$LANG->getLL('enableInstallTool.fileCreate_ok'),
+						$LANG->getLL('enableInstallTool.file'),
+						t3lib_FlashMessage::OK
+					);
+				} else {
+					$flashMessage = t3lib_div::makeInstance(
+						't3lib_FlashMessage',
+						$LANG->getLL('enableInstallTool.fileCreate_failed'),
+						$LANG->getLL('enableInstallTool.file'),
+						t3lib_FlashMessage::ERROR
+					);
+				}
+				$this->content .= $flashMessage->render();
 			}
 		}
 
Index: typo3/sysext/setup/mod/locallang.xml
===================================================================
--- typo3/sysext/setup/mod/locallang.xml	(revision 7568)
+++ typo3/sysext/setup/mod/locallang.xml	(working copy)
@@ -106,7 +106,12 @@
 			<label index="adminFunctions">Admin functions</label>
 			<label index="enableInstallTool.label">Install Tool Access</label>
 			<label index="enableInstallTool.createFile">Create Install Tool Enable File</label>
+			<label index="enableInstallTool.file">Install Tool Enable file</label>
+			<label index="enableInstallTool.fileCreate_ok">The Install Tool Enable file has been created.</label>
+			<label index="enableInstallTool.fileCreate_failed">The Install Tool Enable file could not be created.</label>
 			<label index="enableInstallTool.deleteFile">Delete Install Tool Enable File</label>
+			<label index="enableInstallTool.fileDelete_ok">The Install Tool Enable file has been deleted.</label>
+			<label index="enableInstallTool.fileDelete_failed">The Install Tool Enable file could not be deleted!</label>
 			<label index="tempDataCleared">Temporary data cleared</label>
 			<label index="tempDataClearedFlashMessage">The temporary data has been cleared.</label>
 			<label index="tempDataClearedLog">Temporary data cleared</label>