mongodb can't start on windows?

when i tried to start mongodb using the command "mongod.exe" on the command line, it throws the following error.. ``` C:\mongodb-win32-x86_64-2.0.6\bin>mongod.exe mongod.exe --help for help and startup options Thu Aug 09 11:56:48 [initandlisten] MongoDB starting : pid=6892 port=27017 dbpat h=/data/db 64-bit host=user4-PC Thu Aug 09 11:56:48 [initandlisten] db version v2.0.6, pdfile version 4.5 Thu Aug 09 11:56:48 [initandlisten] git version: e1c0cbc25863f6356aa4e31375add7b b49fb05bc Thu Aug 09 11:56:48 [initandlisten] build info: windows sys.getwindowsversion(ma jor=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1') BOOST_LIB _VERSION=1_42 Thu Aug 09 11:56:48 [initandlisten] options: {} ************** old lock file: \data\db\mongod.lock. probably means unclean shutdown, but there are no journal files to recover. this is likely human error or filesystem corruption. found 3 dbs. see: http://dochub.mongodb.org/core/repair for more information ************* Thu Aug 09 11:56:48 [initandlisten] exception in initAndListen: 12596 old lock f ile, terminating Thu Aug 09 11:56:48 dbexit: Thu Aug 09 11:56:48 [initandlisten] shutdown: going to close listening sockets.. . Thu Aug 09 11:56:48 [initandlisten] shutdown: going to flush diaglog... Thu Aug 09 11:56:48 [initandlisten] shutdown: going to close sockets... Thu Aug 09 11:56:48 [initandlisten] shutdown: waiting for fs preallocator... Thu Aug 09 11:56:48 [initandlisten] shutdown: lock for final commit... Thu Aug 09 11:56:48 [initandlisten] shutdown: final commit... Thu Aug 09 11:56:48 [initandlisten] shutdown: closing all files... Thu Aug 09 11:56:48 [initandlisten] closeAllFiles() finished Thu Aug 09 11:56:48 dbexit: really exiting now ``` i really cant start mongodb.. Help me to start mongodb as windows service and rectify the error. I already read the installation guide and followed the same but still throwing the error.