Youtube slow on my PC HELP!!?

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I'm running windows 7 64-bit, i have a decent internet connection at 22/10 Mbps, using chrome! (i tried other browsers too)

Yet youtube either gives "an error occurred please try again later" or the video takes super long to start and then loads normally.

I know the problem is not with my PC since this only happens at the Wi-Fi at home. Youtube works fine with my school's Wi-Fi (which has a slower connection), and other Wi-Fis. Also when I use a proxy (ultrasurf) at home youtube works like a charm. Also youtube runs very well through my phone or ipad at home.

I've tried everything! Clearing cache, cookies, etc. did not help!
I don't know what to do anymore! Please help!