Tech Support: Choose default program and Open with on right-click context menu on a program not working!?

Choose default program and Open with on right-click context menu on a program not working!?

When I right-click on an application such as a text document, and trying to change its default program (Right-Click, Open with, Choose default program) I get an error says:
"This file does not have a program associated with it for performing this action.
Please install a program or, if one is already installed, create an association in the Default Programs control panel."
There is no problem to open the application, but the problem is the button ONLY!
Fix association .exe, .txt, etc.
didn't do anything!
You can see my thread in SevenForums here:
http://www.sevenforums.com/performance-maintenance/221020-choose-default-program-button-right-click-not-working.html
and this problem like my problem:
http://superuser.com/questions/69193/choose-default-program-does-not-work-is-broken-on-windows

Thanks!

Anwsers to the Problem Choose default program and Open with on right-click context menu on a program not working!?

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Problem Solved by someone post in Vista Forums, that what he said in that thread (Thread link:

http://www.vistax64.com/general-discussion/202928-open-choose-default-program-error-vista-2.html#post939031 ):

" PROBLEM SOLVED!!!!!!!!!!!
HOO HOO!

I would like to thank you again BRINK for your ideas on how to solve this.
The following step below is how I solved this annoying problem:

First I stumbled upon this article on Microsoft's website by changing my google search to fix the problem.
I started searching google with the following:

"open with" context menu missing

That brought up the results with the first being a microsoft link:
"Open With" Command Missing from the Context Menu

Now the article didnt tell me exactly how to fix it but it gave me an idea.
It said to examine the following reg key:

HKEY_CLASSES_ROOT\Unknown\shell\openas\command

And it said to look at the following default value:

C:\%windir%\rundll32.exe shell32.dll,OpenAs_RunDLL %1

After looking at this I noticed the value was different but then I noticed the article said this applies to Windows 95 and 98.
I then looked at the same key on my laptop which is also running Vista Ultimate 32bit and I noticed there were subfolders on my laptop that my desktop did not have.
It should look like the following:

HKEY_CLASSES_ROOT\Unknown
\DefaultIcon
\+shell
\+openas
\command
\+opendlg
\command

My desktop only had the DefaultIcon folder.
Well I just copied the key from my laptop and voila...it worked.
Thank the Computer Gods.
This was really bugging me.
I know some people would have just re-imaged or did a fresh install but I knew it was an easy fix.
I figured it was a reg key or windows dll file but i just needed to find the location that it resided in.
Luckily I stumbled on that article that pointed me in the right direction.
Now I feel like I accompished something.

Sorry if this is a little long but I HATE when Im looking for answers in forums and I see someone say they solved their problem but they either dont say anything at all on how they fixed it or they are so vague that they might as well said nothing at all.
I hope this helps others if they have this problem.

Thanks again BRINK! "

That's all!

Open Action Center by clicking the Start button Picture of the Start button, clicking Control Panel, and then, under System and Security, clicking Review your computer's status.

Update and run your antivirus software. Windows doesn't come with antivirus software, but Action Center can often monitor the antivirus software that you or your computer manufacturer have installed.

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