After installing some program the startup page of my Google Chrome, Firefox and IE changed to http://esurf.biz/?ssid=1444355424&a=1008443. When I open any browser the startup page directs me to some other pages and my antivirus gives warning that am gonna visit pages that contains harmful contents.
Mainly I use Chrome. I tried to change startup page from settings, it didn't worked. So I tried 'Reset Settings', it reset everything except the startup page. The same start up page is still coming.
Also Firefox and IE have this problem. I checked Programs and Features in Control Panel. No program related to this is shown there. How can I change this issue with startup page ?
I checked the answers in the link provided, and tried most of the softwares suggested there. I deleted some suspicious items but it doesn't solved the issue. I can't reinstall OS because its a server and cannot do a reinstallation in the near future.