Your computer has been affected with adware programs that can install bad add-ons to your browsers. Hope this Gamezdoka.org remove guide can help you http://blog.doofix.com/guide-to-removeget-rid-of-gamezdoka-org-pop-up-virus/ It provides much information about this nasty Gamezdoka.org pop-up...
Check this tutorial (about how to create an admin account if you delete it) to see if it can help http://guides.fixtips.org/how-to-create-an-administrator-user-account-in-windows-8.html
Good luck!
From your screen shot, I can see your computer has been at least affected by two adware software, GoSave and Next Coup. They may come together in your computer. You can find more information about Gosave and Next coup in this removal instruction...
It seems that you have got a stubborn adware program....read this article http://blog.doohelp.com/tips-to-get-rid-ofremove-adf-ly-virus-safely-and-securely/
That's a PUP (potentially unwanted program) that can install to your computer secretly with other freeware. You can follow the manual removal guide http://www.removeviruspro.com/how-to-remove-pop-up-ads-browser-redirect-from-google-chrome/ Hope it helps!
It seems that your computer may be get infected with virus. Read this thread http://forums.fixtips.org/internet-options-proxy-server-setting-won-t-stay-off-t39.html
This has been discussed before in this thread http://forums.fixtips.org/slow-slow-internet-speed-with-windows-8-t48.html
1. Check your DNS settings. You can set an IP for your computer instead of letting it obtain an IP automatically.
2. Disable your IPV6 in your computer, this could somehow...