Lightroom 3 upgrade to LR4 not registered in Community Help

Question

I recently upgraded my copy of Adobe Lightroom from v3.6 to v4.2.  After verifying the new install was working properly and converting the catalog I uninstalled v3.6.  When I go to help in the Lightroom menu the Community Help application starts in its own window and displays help for version 4 in its right hand conent window as it should. However the left hand search pane displays "Search Bridge Content" - not "Search Lightroom Content" - in its search term entry box.  The content choice pull-down menu next to the search term entry list Adobe Bridge CS5, Photoshop CS5, and Lightroom 3 (no longer installed), but NOT Lightroom 4 (currently installed).  Similarly the Community Help home page lists Photoshop CS5, Bridge CS5, and Lightroom 3, but not Lightroom 4.  How do I remove the old reference to Lightroom 3 references from both the "search help content" selection menu and the Community Help home page and replace it with Lightroom 4 as currently installed?
In a second issue, attempting to sign-in to my Adobe ID account through the Community Help Account menu fails even though the ID and password supplied are correct.  After entereing my password and pressing "Sign In" the  dialog box gets stuck on the screen with nothing happening, requiring me to close help and restart it to move on.

Answer 1

Further complications .... after posting my first message I did some more searching which lead me to the Help Manager download page at http://www.adobe.com/support/chc/.  Following the instructions I selcted the pull down for the product, exanded the list with the "more products" link, chose Lighteroom, and clicked the install button.  Cliucking "Lightroom Help..." in Lightroom's Help menu now brings up Lightroom 4 instead of 3 BUT it is displayed in my browser, not the help viewer application where help was previously displayed.  Further, my help menus for installed applcations Photoshop CS5.5 and Bridge CS5 are a) displaying online help instead of local help; and b) displaying help for CS6 instead of the installed CS5 versions as it should.  There are no CS6 applications installed on the system.
The link in your reply does not download the configuraqtion file.  Instead it opens the XML source code for the file in my browser.  I have copied the complete XML code into a new text file, named it Lightroom_4.0.helpcfg, and saved it into the directory you specified but there is no apparent affect.
BTW, OS is Windows 7 32-bit.  The application that opens when selecting "Adobe Help" from the Windows Start button application menu now identifies itself as "Adobe Help Manager 4.0.0.244"  I believe previously it was the Help Viewer version 3.5.4 if memory serves.  The Accessability Mode option settings that were previously avaiable in the application's General Settings page the allow one to choose between opening help in the Community Help application or in the browser are no longer there.