I am leaving town for a couple of days. Back on Sunday night to continue the struggle. Thanks for all your help so far.

Ok, let us know when you get back and we'll take it from there

I had exactly the same problem except there's a different reference for the pre-fetch file. I have just removed and re-installed Photoshop and the error message came up again during installation. The program worked OK but the error still appeared when I tried to access any of the help files.

I found this thread and followed the advice:
http://www.photoshoptechniques.com/f...ad.php?t=15959 and also: http://adobe.groupbrowser.com/search...e+written.html and find that deleting all the folders and files in Adobehelpdata except Packages and then running ahc.exe seems to have done the trick.

The adobe.groupbrowser looks like a useful resource. Hope this works for you!

Dammit! I've spent so long trying to get the help system running I've completely forgotten what it was I needed help for.........

Lol , dont worry. We'll be here when you do remember what it was.

Thanks for helping btw.

Have done everything. Still no resolution. Also, I notice that I am not able to view PDF files in Internet Explorer.

Someone suggested that I uninstall and delete everything related to Adobe, including any references in the registry