Alikhan:
I do not have a Router-I have a cable modem attached to a home connection.
Long ago, my computer tech advised against installing any Windows Updates because they cause more problems than they claim to solve so I turned them off.
I have not noticed any pop-up warning issues, my computer has not become slow or crashed at any point, and I am extremely careful to only visit legitimate websites.
I should have mentioned that Avast and my anti-malware software are up to date, my Windows firewall is on, and Windows 7 x64 Home Premium is being run.