The power and ADSL light on my router are flikering. Have no access to the internet. I have rebooted several times but still does the same.

The phone line does two jobs. Voice phone which is what it was originally used for and ADSL modem which works at a high audio frequency.
Somewhere between the phone socket and the modem should be a filter splitter. One part goes to the phone and the other to the router. Make sure you have that.
The modem will have a power light and several additional lights. Assuming the power light is on we are interested in two of them; The ADSL light and the Internet light. When you switch the modem on you should first see the power light flash then go solid. Then the ADSL light will flash and then this should go solid. If this light does not come on then you have not plugged the phone wire in properly. If this light just keeps flashing slowly then the modem can't see an ADSL signal on the phone line. If you have a spare router you could try it and see if the ADSL light goes solid on that.
If the ADSL light is fine then the modem has locked onto the signal on the phone line, sync'ed. If not then this is the problem you must solve. Ask your ISP if service is set on your line.
The next light is the Internet light, this maybe a symbol like an i or a world. This light will begin flashing then go solid. It will flash with Internet traffic. This means you have Internet, as far as the modem is concerned. If this light does not stay on then your ADSL account name and password maybe wrong. You can correct this but that's a different question you need to ask.

The ADSL installation details have changed, so you need to update the router.

Check the router has not been moved too far from the laptop.

First of all, can you confirm that you get internet access continuously when connected to the Modem directly? If No, I would suggest you talk to the ISP else lets try the steps below, .
So try power cycling the entire setup
1. Power off your modem 2. Power off your router
Now Switch on your modem, leave it for a minute and then switch on the router. Usually a power drain will help. I noticed that you have been switching off your router several times. Lets try this once
Alternatively, I would suggest you reset the router once and set it up again.

IT HAVE A PIN HOLE OR REST SWITCH ON ITS BACK
RESET YOUR ADSL
RECONFIGURE THE ADSL
TYPE 192.168.0.1 OR 192.168.1.1 IN BROWSER
DEFAULT PASSWORD Is
username- admin
password -admin

now reconfigure your settings in option (settings)


save & reboot the router
it will work

reset set the modem first. then connect the one system to adsl modem. type 192.168.1.1 in browser. enter user name&password.go to interface setup tab-internet--select bridge mode--save and reboot. now remove that take router connect to system type 192.168.1.1 in browser. enter user name&password.go to interface setup or advance setup in that wan tab or internet tab select dynamic ip and lan page give different network address eg-10.0.0.1 for router 10.0.0.2-...254,255.0.0.0,10.0.0.1 save and reboot it will work or just call 08041478653 , 9740575949

Call your internet service provider and ask them to check your connection to be sure that it was not chewed through by an underground rodent of unusual size. Ref: Princess Bride

There's a possibility that the router is already going bad but you can try first updating the firmware of the router because sometimes this problem is related to the software of the router so you may need to update its firmware,but if still after updating and still the same a new router will be the best solution for this problem of yours..You can also call this number for technical support help and double checking if the router is bad or still can be fix 1-877-787-8749...

Don't forget to rate the solution FIXYA thank you....

u can do one thing like changing the soft ware on the device and reboot it and check

It sounds like an ADSL signal strength issue. Test that it is not a problem with the ADSL phone cable setup, using the shortest ADSL/Phone cable you can find (under 1Meter is best)unplug all other phone line using devices and filters from the wall jack points and test the routers connection again as the only device plugged in(this is Isolation testing) If the issue replicates itself under isolation testing conditions then ring your ISP providor and request that the "ADSL signal voltage" needs to be increased slightly as your router is not hearing the ADSL signal properly. If the issue doesn't replicate itself under isolation test conditions, you are either using an old or bad ADSL/Phone cable or your cable is too long (should not be longer than 5meters)or if you are using a wall socket/splitter for direct adsl access (without filters)then test the socket with a filter to verify the socket/splitter is not the cause of the problem, if you do use phone filters, during isolation testing, test each of the filters individualy with the router and see if the disconnection issue is replicated if so replace the bad filter the disconnection issue was being caused by phone signal interferance. Your third request requires you to setup the LAN info on the windows side of your connection not the wireless card, this can be verified by searching for websites via thier IP address which will work, when searching via their website name wont, DNS resolution issue, it is probably best practice to use MAC Addressing for your wireless setup though.