Websites look very wierd?

[unknown]

So a while ago my internet started lagging so I reset my modem. now some websites like youtube look like text only (Heres what YouTube looks like; YouTube

My Channel
Video Manager
Subscriptions
YouTube settings

Google Account

Profile
Google+
Privacy
Settings
So it's very annoying aswell as that, almost every time when I connect to any website I get a msg saying "This connection is untrusted!" from every browser, chrome, firefox, IE all come up with the same thing, I even uninstalled firefox and reinstalled it but it still looks the same buggy pile of crap.

I've refeshed around 20 thousand damn times and even switched my DNS server and reinstalled it

Someone please tell me how to fix this, I will be extremely greatful.

[Lokesh]

Change your ip address and do that, i think it will help you. Thanks.

[Sourabh]

Check your system's date & time, if it is wrong set it to today's date & close all the browsers & check those websites in all the browsers.