I just append -vm C:\\Program Files\\Java\\jre6\\bin\\javaw.exe
in ec
Make sure the Eclipse and the Java that you are using are both either 32-bit or 64-bit.
You cannot run 64-bit eclipse with 32-bit JRE.
java -version
Java HotSpot(TM) 64-Bit Server VM
64-Bit
The 32 bit version JRE will not have 64-Bit in it.