If you can access the internet, you might try going to support.microsoft.com and search for information on Help Update. At one time there was an update that installed all the necessary functions for the newer .chm compressed help files and it's functions.
Also (re)installing the DCOM components might also repairs this.
Again, if you can access the internet, you could try the Windows Update link in the start menu and let it scan the system and install critical updates and then other items listed, especially related to help functions.
If you pc won't access that site, or you get errors when doing so, you will need to run regedit. NOTE: Running regedit can cause system failure if you are not familiar with its use and don't take the properprecautions, such as backing up the registry prior to making any changes! Search for the key "RegDone" (should be under HKLM/Software/Microsoft/Windows/CurrentVersion/) and change its value to "1". This will allow you to use the online update siteto scan your system.