Hello!
If you are using XP or 2000
Try this and see if it helps:

Open the task manager by pressing CTRL+ALT+DELETE. Go to the processes tab. Find javaw.exe and right click on it. Change the priority to low, and your system should be acting normal and responsive again.

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<img src="http://www.jordysworld.de/emoticons/blob16.gif">Sincerely Joakim Agren!