I run run.bat with minecraft.jar in lib folder and get this:

Autodetecting java

Testing default folder

Checking C:\Program Files\Java\jre6 folder

Found java in C:\Program Files\Java\jre6 folder

Starting java from "C:\Program Files\Java\jre6\bin\java.exe"

ERROR: Failed to run minecraft

JAVA6="C:\Program Files\Java\jre6\bin\java.exe"

Press any key to continue. . .

What is going on?