Your More system details list shows that you have the "Next Generation Java Plug-in 1.6.0_22", so that should be OK.
Does Java work on the test pages?

• http://www.java.com/en/download/help/testvm.xml - How do I test whether Java is working on my computer? - 1.4.2_xx, 1.5.0, 6.0
• http://www.java.com/en/download/installed.jsp - Verify Java Version

There are other things that need attention:
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.

• Shockwave Flash 9.0 r115

Update the Flash plugin to the latest version.

• http://www.adobe.com/software/flash/about/

If the dictionary program you are using is "Longman Dictionary of Contemporary English (Updated edition)" , I believe you will find the soluation on the following website:

http://pearsonsupport.helpserve.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=301

The above solution given above by DavidLNWong is also working for "Oxford Advanced Learner's Dictionary - 7th edition" however the path on your pc would be "C:\Program Files\Oxford\OALD7\defaults\pref".

I can't reach the URL, could you please correct it. and by the way, I found the link above by googling it but I couldn't download the patch, do you have the patch? if so, be a sport and upload it somewhere else. I'll be thankful if anyone could do that for everyone's having this problem

The URL is dead but you can find it here: http://pearsonsupport.helpserve.com/Knowledgebase/Comments/Submit/240/ The patch file link does not work as well. But I manage to solve the problem on my PC by following these steps:

Open Windows Explorer and browse to the dictionary installation directory (typically C:\Program Files\Longman\ldoce4v2). Browse into the "defaults" folder, then the "prefs" folder. Rename the file "winpref.js" to "winpref.js.old".

Hopefully it helps.

thanks a lot,pal it did the trick

In fact, the only thing to do is modify the winpref.js (open it by notepad), and find the following line:

// Locate plugins by the directories specified in the Windows registry for PLIDs

// Which is currently HKLM\Software\MozillaPlugins\xxxPLIDxxx\Path

pref("plugin.scan.plid.all", true);

command the last line by plus "//" at the head of the line:

// Locate plugins by the directories specified in the Windows registry for PLIDs

// Which is currently HKLM\Software\MozillaPlugins\xxxPLIDxxx\Path

//pref("plugin.scan.plid.all", true);

and save it. Now re-open the Longman, it works!!

About the sugestion by awj141: This really resolved my problem.

Only substitute this: pref("plugin.scan.plid.all", true);

For this: //pref("plugin.scan.plid.all", true);

Only put two simbols (//) at the head of the line.

Cool! Thnaks!

great thank pal.i try to find all the way.but the NOTE patch file which noted tobe download is rather quite dim.that makes rather to see its notice. you need to make it outline and clearer.anyway.gracias.merci boucoup!!!!!