Netgear Router won't load Gmail or Google Domains

Please, can anyone help me?
I have a Netgear MBR624GU 3G router. Internet access works, the only problem comes when I want to use Google or Gmail (http), _the page most of the time won't load or takes ages._
When I use my Windows laptop it connects - no problem.

I have tried disabling the security settings, change mode options "b&g" or just "g" and the channel number, with no luck.
Any suggestions will be greatly appreciated.