OK now finally i fixed it after 2 days of war with eclipse, so for some reason when groovy plugin was installed eclipse modified config.ini file inside configuration folder
so i have to modify config.ini file to replace 'osgi.bundles' value with
osgi.bundles=reference\:file\:org.eclipse.equinox.simpleconfigurator_1.0.100.v20090520-1905.jar@1\:start,reference\:file\:plugins/org.eclipse.jdt.core_3.5.0.xx-20090828-1900-e35.jar@4,reference\:file\:/Applications/galileo/plugins/org.apache.commons.collections_3.2.1.jar@4,reference\:file\:/Applications/galileo/plugins/org.apache.commons.lang_2.3.0.v200803061910.jar@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy_1.7.0.xx-20090828-1900-e35/@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.ant_2.0.0.xx-20090828-1900-e35/@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.codeassist.completion_2.0.0.xx-20090828-1900-e35.jar@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.codebrowsing_2.0.0.xx-20090828-1900-e35.jar@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.core_2.0.0.xx-20090828-1900-e35.jar@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.core.help_2.0.0.xx-20090828-1900-e35/@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.cstviewer_2.0.0.xx-20090828-1900-e35.jar@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.refactoring_2.0.0.xx-20090828-1900-e35.jar@4,reference\:file\:/Applications/galileo/plugins/org.codehaus.groovy.eclipse.ui_2.0.0.xx-20090828-1900-e35.jar@4,reference\:file\:/Applications/galileo/plugins/org.eclipse.jdt.groovy.core_1.0.0.xx-20090828-1900-e35.jar@4
By default osgi.bundles value is osgi.bundles=reference\:file\:org.eclipse.equinox.simpleconfigurator_1.0.100.v20090520-1905.jar@1\:start but as soon as i installed groovy plugin i had a modified value which caused eclipse fali to start.
now my eclipse starts and i see the groovy features too..