Jimbowin wrote:

thanks Mike ,
I got this pc a week ago , the video was working but I didnt check
the audio , now only a few of the video files are working .
upon checking -
The device manager says - Crystal WMD audio codec is working properly
, but in sounds and multimedia properties it says Crystal WMD -
audio codec driver is disabled ,
then further on - audio for crystal codec - driver is enabled but
inactive due to unknown problem.

OK, so there's your problem, the audio drivers. Try uninstalling and then
reinstalling the drivers and see if that fixes the problem. You might
want to try downloading and installing a new driver set. Hopefully you
will find a link on the manufacturer's site for your PC. I don't seem to
be able to locate the Crystal site but have a look at this Lenovo site
(http://www-307.ibm.com/pc/support/si...GR-4PJN95.html) which
explains how to find out the current version of your driver and also
provides a link to a driver set (v5.12.01.4031a) that may, but also may
not, work on your PC.
--
Mike Maltby
MS-MVP Windows