How to update the NWDS to 7.31?

Hi Dude,

the version of my NWDS is:

SAP NetWeaver Developer Studio

SAP Enhancement Package 1 for SAP NetWeaver Developer Studio 7.3 SP03 PAT0000

the update file downloaded is:

updatesite-management-tool-7.3-SP03-PAT0000-win32

whereas after the file updatesite-management-tool-7.3-SP03-PAT0000-win32.rar has been extracted, nothing happended when the executable file updatesite_tool had been triggered.

please find the message displayed in the console in the attached file.

so my question is:

how can i use this update file to update my NWDS to 7.31 version?

the java installed on my pc is:

1.6.0_07 SE runtime environment

thanks