Again, I get confused with my PC's Local Area Connection(Status: Limited or no connectivity). I'm not sure about the reason, but it happened for almost a week until now. How to solve it? I mean how to repair the connection?

What type of connection is it and what else did it say about it?

Limited Connectivity is almost always associated with the loss of locating the
DHCP service on your network.

First question is, What has changed? Did you take a laptop elsewhere, connect
and then later bring it back home and it now fails?

We need a description of all devices from the ISP to your system,
Connection type, modem make/model, router make/model, system connection type
(wired vs wireless {with the make/model of the adaptor} )

If your system is a desktop, have you tried powering off the modem,router,system and restarting each with a one minute pause between each?

Thanks guy, I had solved the problem, I think I had accidentally changed the setting of DCHP client service in my desktop into manual.