I'm not sure what you mean by "click on avchd it find it why not DVD it work find on elements 7 "
Are you saying that you have version 7 installed on the same camcorder and it can burn directly to a DVD but version 10 can not? (I don't know what version 7 had AVCHD disc burning capabilities.)
Welcome to the forum.
The most common issue, when one receives a "Burner Not Detected," or similar error message in PrE, is a conflict with other software on the computer, that "hooks" the burner at bootup, and reports that is not really a DVD burner installed (most often it is defining the DVD burner as a removable HDD), to the OS. This article goes into more detail: http://forums.adobe.com/message/3127429#3127429
Also, some other reading that may help
Online User Guide http://helpx.adobe.com/premiere-elements/archive.html
Saving & Sharing http://forums.adobe.com/thread/1137128
-Sharing to DVD or BluRay http://forums.adobe.com/thread/1137645
-Sharing for Movies http://forums.adobe.com/thread/1051093
-Sharing for Computer http://forums.adobe.com/thread/1058237
Steve's Basic Training Tutorials... steps are the same for several versions
-v10 http://www.amazon.com/Muvipix-com-Guide-Premiere-Elements-Version/dp/1 466286377/