Software

Hi,
Open IE, select tools \ internet options \ avanced then tick the disable script debugging box and see if you still get the error. If the box is blank IE will fall over every time it hits a problem in a web page (CHM help files are displayed va IE).

To resolve this problem, extract and register a new copy of the Hhctrl.ocx file. This section shows how to do this.
Step 1: Determine the Version of Hhctrl.ocx
To determine the version number of the Hhctrl.ocx file, follow these steps:
Click Start, point to Settings, and then click Folder Options.
Click the View tab, click Show all files, click to clear the Hide file extensions for known file types check box, and then click OK.
Click Start, point to Find, and then click Files or Folders.
In the Named box, type hhctrl.ocx. In the Look in list, click My Computer, and then click Find Now.
In the list of items that are found, right-click the Hhctrl.ocx file that is stored in the C:\Windows\System folder, and then click Properties.
Click the Version tab, and then note the number that is displayed next to File version.

The version of Hhctrl.ocx that is included with Microsoft Internet Explorer 5.0 or Internet Explorer 5.01 is file version 4.73.8412.
Step 2: Extract a New Copy of Hhctrl.ocx
Extract a new copy of the Hhctrl.ocx file for the version of Internet Explorer that you have to the Windows\System directory. (To determine the version of Internet Explorer that you have, start Internet Explorer, and then click About Internet Explorer on the Help menu.)

If Internet Explorer 5 is installed, extract a new copy of Hhctrl.ocx from your Windows 98 CD-ROM.

If a different version of Internet Explorer is installed, extract a new copy of Hhctrl.ocx from the Hhupd.cab file on the Internet Explorer CD, or install the latest update for Windows HTML Help (see "More Information"). For additional information about extracting files in Windows 98, click the article number below to view the article in the Microsoft Knowledge Base:
129605 How to Extract Original Compressed Windows Files

You said that you have the latest office patches installed. Make sure that your windows is patched as well via MS windows update. If the problem is persisting, first reinstall office, reboot, reinstall office patches, reboot. Make sure that you reinstall from fresh media or download as your current CD may have a corrupt file. If problem persists after that, re-install windows, all service packs, then office again and perhaps image for other pc's. Check for ad- or spy-ware with AdAware and SpyBot Search & Destroy (both free downloads) and make sure that your anti-virus is up to date.
HTH