Error: This file does not have a program associated with it for pe

When I try to open videos that a friend sent me I get a box with a red X
stating: This file does not have a program associated with it for performing
this action. Create an association in the Set Association control panel. I
have opened the Control Panel selected Default Programs then Set Default
Programs and click on each program they all say "This program has all its
defaults." When I go into associate a file type or protocal (Set
Associations) there are a lot of descriptions that have Unknown application
as their Current Default. However, when I have clicked on them it says that
changing these can damage my system. HELP!!!!!

What file extension are the videos in question?

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Speaking for myself only.
See http://zachd.com/pss/pss.html for some helpful WMP info.
This posting is provided "AS IS" with no warranties, and confers no rights.
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"Jewels6677" <Jewels6677@discussions.microsoft.com> wrote in message
news:75A10A07-85A5-4CE0-B894-D818D402100D@microsoft.com...
> When I try to open videos that a friend sent me I get a box with a red X
> stating: This file does not have a program associated with it for
> performing
> this action. Create an association in the Set Association control panel. I
> have opened the Control Panel selected Default Programs then Set Default
> Programs and click on each program they all say "This program has all its
> defaults." When I go into associate a file type or protocal (Set
> Associations) there are a lot of descriptions that have Unknown
> application
> as their Current Default. However, when I have clicked on them it says
> that
> changing these can damage my system. HELP!!!!!