Open the eclipse folder and edit the eclipse.ini file:

 

Please check if the file has the -vm parameter, if not, then add it.

 

-vm

C:\Program Files\Java\jdk1.6.0_10\bin\javaw.exe

 

Note: It should be add before the -vmargs parameter.

 

See my eclipse.ini, just like the following:

-startupplugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar–launcher.libraryplugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.200.v20120522-1813-productorg.eclipse.epp.package.jee.product–launcher.defaultActionopenFile–launcher.XXMaxPermSize256M-showsplashorg.eclipse.platform–launcher.XXMaxPermSize256m–launcher.defaultActionopenFile-vmC:\Program Files (x86)\Java\jdk1.6.0_17\bin\javaw.exe-vmargs-Dosgi.requiredJavaVersion=1.5-Dhelp.lucene.tokenizer=standard-Xms40m-Xmx512m

Please pay attention to the bold and red characters. 

I hope it will be helpful to you! Enjoy it!