Hi rmg,
I dont see LOCKFILE, this problem raised when I installed CE version of Centrasite in same webMethods7 folder.
proxy error is occurred running below step in server.bat file,
rem run integration server
title webMethods Integration Server
%JAVA_RUN% -DWM_HOME=“%WM_HOME%” -classpath %CLASSPATH% %IS_PROXY_MAIN% “%IS_DIR%”\bin\ini.cnf %PREPENDCLASSES_SWITCH% %PREPENDCLASSES% %APPENDCLASSES_SWITCH% %APPENDCLASSES% %ENV_CLASSPATH_SWITCH% %ENV_CLASSPATH% %1 %2 %3 %4 %5 %6 %7 %8 %9
Centrasite, broker are running… Couldnt start IS 
#Integration-Server-and-ESB#webMethods