Have a look here:
http://wiki.lyx.org/pmwiki.php/LyX/WindowsSetup
Midway down this page is a section which should answer your questions.
Plus there are many other things listed on this page which you might find of use.
Rob S
After installed of Lyx (under D:\Program\lyx), I opened lyx and try to reconfigure it (Edit->Reconfigure). In the DOS window, it lists the paths name in my windows variable, and finally it outputs "The system cannot find the path specified". I notice that D:\Program\MiKTex\Main\tex\latex is already in the PATH.
I am not sure what the reconfiguration function is looking for. Anyone can help me with this?
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