Unable to execute file (I have execute permission)

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http://www.linuxquestions.org – Code: root@ubox:/HD2/project1# uname -a Linux ubox 3.2.0-43-generic #68-Ubuntu SMP Wed May 15 03:33:33 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux root@ubox:/HD2/project1# file main main: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0x93432f463339567ab8ee4effaa026431f6d031d3, not stripped root@ubox:/HD2/project1# ls -lha main -rwxr-xr-x 1 root root 2.2M Jul 20 23:20 main root@ubox:/HD2/project1# ./main bash: ./main: Permission denied So... any ideas? I have execution permission... the directory in which the file (HowTos)