Pages in Content tab not working

[itsmetim]

Hello.  I'm running CMS Version 1.8.2, using PHP 5.2.8, MySQL 5.0.91, working with Apache on Linux. 
I've finished installing, and the first thing I tried was to adjust the pages, in the content tab.  When clicked, an error is produced saying:

Warning: require(/home/content/b/a/b/babushoes/html/lib/xajax/xajax_core/xajaxPluginManager.inc.php) [function.require]: failed to open stream: No such file or directory in /home/content/b/a/b/babushoes/html/lib/xajax/xajax_core/xajax.inc.php on line 257

Fatal error: require() [function.require]: Failed opening required '/home/content/b/a/b/babushoes/html/lib/xajax/xajax_core/xajaxPluginManager.inc.php' (include_path='.:/usr/local/php5/lib/php') in /home/content/b/a/b/babushoes/html/lib/xajax/xajax_core/xajax.inc.php on line 257

As far as I can tell, everything functions.  I tried to run the System Verification, but frankly, I don't understand which file to upload, either.

My very uneducated guess is that some part of the install was messed up.  Is this possible?  More so, is this possible to fix without reinstalling everything?

Thanks in advance for your help .

[Dr.CSS]

How did you get folders/files to server? if FTP maybe not all files made it, also check system information page to see if any yellow ! or red X in it...

[itsmetim]

I did use FTP.  Is there a way to simply add the missing file?  I'm not sure how to track down the correct one.

I have four yellow !'s:  Current PHP Version, Maximum Execution Time, Maximum Post Size and Maximum Upload Size
I assume these are unrelated...

[NaN]

Just upload the dir "lib/xajax" again.

[itsmetim]

I tried this, but now my login to the admin section is not working.  Is this tied into the xajax directory being replaced, or is something else wrong now?