"The proxy server isn’t responding"

Hello,

Kindly help me with this proxy server error issue. I have tried everything! I do not have any other antivirus other than microsoft security essentials.
I need chrome to work asap as my work needs internet most of the times. Also, Google earth software, which is essential for my work, shows connection problems.

Please look into my query and see what can be done.

Awaiting in anticipation,
Regards,
Pastel