VFP Help File Problem

For some reason my VFP Help file will not load. When you select help it goes into the "indexing for the first time" and never returns, requiring task manager to stop the process.

Loading up the help chm by clicking on it does the same thing but immediately finishes the index and loads fine.

I have tried updating the help with the newer SP2 help file to no avail as it still does the same.

Any ideas?

Dave