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Cant login after enabling lightning in dev sandbox

I enabled my lightning experience in my developer sandbox. after that i tried to login to my account it is not allowing me to login. i was getting this error,

User-added image

Siddharth ManiSiddharth Mani
This shouldnt be the case. Can you try in another browser and see if you are able to login?
If so, the issue could be due to a Windows update patch (uninstalling which would solve the issue):
I tried different browsers but still getting the same error. Is there any way i can disable the lightning experience?
Siddharth ManiSiddharth Mani
I guess you can only disable it once you login. Are you able to login to salesforce itself (some other org) ? If so, then you can contact salesforce and maybe they will be able to disable it for you else there might be an issue with your internet / proxy settings.
Thanks siddharth actually i tried logged in using my mobile browser. it was working then i disabled my lightning experience and tried to login again . it is working fine now.