Thread programming behavior

Hello,
Right now I'm very new to a multi-threading programming and from the example I already applied it to my simple program and I found out that when I set my new thread to a HIGHPRIORITY, all of my menus are become very slow and when I set it to a CRITICAL my window will no longer responce.
Is there a secret way to handle this? or Is there any link that explain this?

Thanks...

All threads running in the system share the same CPU. If you set one thread priority higher than another, that thread will get more CPU time and the performance of the lower priority thread will suffer.

In general, you will want to set the priority of worker threads down not up, in order to maintain the response of your user interface.

Thank you very much for the idea. Now I know the limitation.

Hi, thread-programming related stuff here:

http://www.codeproject.com/threads/