While trying to login some websites a error commonly shows that “Cookies are not enabled in your browser” but it would be actually enabled.
How to get rid of this problem?
if you are using Internet explorer, set all slider into "Low" level under the Tools>Internet Options>Security tab.
Hit apply restart your browser and try again.
Note: restore all the sliders to the default level after you finished browsing certain websites. Otherwise your computer information are unsafe. Because this is a security issue. Do this trick only with trusted or very known sites by you.