would you please explain a little more?
i seem to be having the same problem...some videos only play sound but no video...and i cant seem to find the place in the registry that you are talking about...
the only solution i have found is to use VLC Player...It works for every video...
I opened Regedit ( windows registry editor)
click on windows start button, type in regedit in search box, open regedit.
open the following location
open computer, HKEY_LOCAL_MACHINE, SOFTWARE, MICROSOFT, MEDIAPLAYER.
ok, if you click on any entry under the mediaplayer node and it states an error that you cannot access that entry you probably have the same problem. This error occurs because there is no owner specified and no permissions specified for that entry.
What i did was the following:
I clicked on all the entries, and if the error popup appears, i clicked ok on error message (it is the only choice one have)
Then right clicked on same entry, then it will display menu, click on permissions.
A warning message pops up - cannot remember what it said.
just enter or click ok to close message.
now you should see permissions window in front of you.
Another warning appears between these two windows. click "ok"