My internet keeps dro, i have installed fil...

There is one case where everything is fine but still connection drops too often.---
This happens when the network type of your laptop is "public" as ublic networks are less secure, routers usually drop connections after sme time. Change the network type to "private". This should solve your problem. There is one more setting in your router where is says something like "automatically login when disconnected". Selecting this option allows automatically login to ISP when connection is dropped from ISP temporarily.

If network connectivity itself is the problem then you can debug followingly.

Step-1:
If ISP company says everything is fine from their side, then you need to check your router. To confirm this first connect the wall outlet of ISP to your laptop and check network connectivity. If there is problem, then ISP has to fix it.

Step-2:
If connection works fine then ISP is fine and you need to check your router settings. Now check network connectivity by connecting the laptop to the router through a ethernet wire. If the network does not work then your router hardware could be wrong and may need servicing or replacement. If this works fine then go to step-3.

Step-3:
Try resetting your router by using a paperclip. Usually the reset button can be found at the backside of your router. This will reset all the settings and there by making as good as a fresh one. Try to access internet from a place close to router where router signal is strong.
Change authentication and other network settings of your router to connect to ISP. Now network should work fine. Ensure that you set router password to avoid unauthorized access to your router by others.