Hi,
May be the below steps help you for removing manually :
Step One: Disable the processes of gamersinfo.org adware.
1. Press Ctrl+Alt+Del/ Ctrl+Shift+Esc keys to open the Task Manager.
2. Search for all the running processes of gamersinfo.org adware then disable them one by one.
Step Two: Uninstall the unwanted programs related to gamersinfo.org adware.
1. Open Control Panel from Start menu and click Uninstall a Program link.
2. In the Programs and Features window, select gamersinfo.org adware and other unwanted programs and click Uninstall to remove them all.
Step Three: Eliminate gamersinfo.org adware from browser.
Internet Explorer
1. Click Tools then select Internet Options from the list.
2. In the Internet Options dialog, move to Advanced tab and click Reset button.
3. Move to General tab, put a desirable website in the homepage column to reset the browser start-up page.
In Mozilla Firefox
1. Click Help from Firefox menu and choose the Troubleshooting Information from the list to open it.
2. Click Reset Firefox button and then Finish button to restart Mozilla Firefox.
3. Open the Firefox Options from the menu. In the pop-up dialog, type in a new homepage address and confirm the changes.
In Chrome :
1. Click wrench icon and select Settings from the list.
2. Click Show advanced settings and then Reset browser settings button.
3. Move to Appearance section at the same setting page, tick Show Home Button and then click Change.
4. Reset a new homepage address and save the changes.
Try this steps and if it does not work out may be try for some PC Cleaner tool with booting your PC in safe mode.
Hope this helps.