NT Option Document NOT WORKING

[Cap2010]

HI,

I have installed NT option Pack 4 Documentation
and was working earlier, suddenly after a week system had
a problem and then it stopped. I re-installed the documentation, it does displays through contents,
THE TROUBLE IS ON SEARCHING. when trying to search
on a particular topic or simple word it gives
the following err

The specified procedure could not be found.
Question is
How to make search engine work again.

Thanks,

Lad