[Urgent] : Unable to install TestNG in Eclipse hellios service release2

[Dev]

Hi All,
I am Unable to install TestNG in Eclipse hellios service release2 as I am getting error "Unable to connect to repository" everytime.
I tried different solution from google but still getting the same error. I am setting up this on my system in Office.

Anyone kindly help in this regards.

Thanks in advance.

I know this is a very simple process to setup testNG in eclipse and even I have done this on my home PC very easily.

Thanks
Dev