Unable to open few websites in my system

Hi....my os is windows 7......recently i've installed kaspersky internet security 2015 in my system and all the protection settings are on in it. from then i'm unable to open certain websites in my system....i'm get 502 error or 404 error...but through the same wi-fi connection i'm able to open all the websites in my mobile...can anybody help me out with this

Thanks

 

Hi,

have you tried disabling the AV and check if you can go on these websites

 

Go through the suggestions here for proper settings
http://support.kaspersky.com/11210