Help files in any application which judge you what the application meant for and what are the various tools which you can use with this application. These help files teaches you and know more details of the tools which come equipped with and thus provide you the better understanding of the terms and tools of the related application.

Not contrary from the other applications, MS outlook also gives you the help files through which you can better understand the information about the tools which you can use and the objects of the Outlook. These files include address book, after deleting an Open item,  Distribution List, Mail Folders, Reading Layout, Rules-wizard, Signature, Word as your mail editor and many similar. The help files can be accesses from the help option of the toolbar in Outlook.

Now for the new user and even for the experienced ones, these help files provide a better option to work and know the things better. So at this stage if these files get corrupted then you certainly need to fix them.

When the help files get corrupted or damaged then those may get open but will not display any of the topics or the text within the help window may be unreadable. So to come with the situation you need to do these two steps:
•    Rename the Help files to .old
•    Reinstall MS Outlook

You can rename the help files by looking for the *.chm files. For this, you need to type this file name in the Files and Folders option of the Search option. After this, MS Outlook is reinstalled for getting the new copy of the help files.

This would solve your problem but simultaneously another trouble may arise in the form of PST corruption. All or few of the mails, important contacts and many Outlook objects may get corrupted during the procedure of reinstalling. In this case you left with no other option then PST repair.

PST repair is the work performed by third party applications known as PST repair tool. These are the software which repair Outlook PST regardless of the reason of corruption. All they do is the systematic scan of the corrupted PST files and extraction of the data thereafter.

There are probable chances of overwriting of the data by the wrong working procedure of the PST repair software. So be little selective while choosing the correct software for your corrupted PST files.

Stellar Phoenix Outlook PST Repair is the most advanced utility, built specifically and efficiently for repair Outlook PST. This software has no issue in working with Outlook 98, 2000, 2002, 2003 and 2007. This PST recovery software runs the most powerful scanning algorithms, so you need not to worry about the complete PST repair.
The software comes equipped with the user interface which is easy to handle and use and you can have PST repair in just few clicks. This will repair all the Outlook objects and all the protected and encrypted files. You can have an idea of its performance through its free demo version which is offered by the company at the website.