Tp link tl-wr740n how to install without cd - NetGear RangeMax NEXT WNR834B Wireless Router

Means no internet connection , better check the network connectivity properly.

Milan have you got the user manual as it clearly explains how to set up the router and configure it manually !
http://www.tp-link.com.au/resources/document/TL-WR740N_V5_User_Guide.pdf
Your modem device already on your network has to have an IP address of 192.168.0.1 and according to the user manual the router detects the conflict in ip address and allocates its IP address as 192.168.1.1. If you IP address is different say 10.0.0.1 then you will have to plug just the router in to your Laptop and alter the i/IP address to 10.0.0.2 and turn off the DHCP server if the modem or existing router has DHCP. You will need to alter any existing DHCP server to have the first 10 IP addresses skipped for available leases to the computers.

Yes! Enter the settings menu and input the correct settings for your service provider manually.....the settings are available from your service providers!

If you reset the router, you return to the default setting. Then you have to create a new password. All of the settings you had before will be lost, including the MAC address, and security settings.
Here is a link of a video to help you:

TP Link TL WR740N Router Manually setup and configuration

on a computer that has internet access, go to tp-link.com support page and download the appropriate drivers.

Do the factory setting of it router n check its wifi without any wifi security enabled,if it's working fine then changed the security setting, hope this ''ll help u....

I don't have the same router, but my router requires the reset button to be pressed and held for 20 seconds. Try that. Also, I have found the manual on-line. Try the link below:

https://www.manualslib.com/manual/534658/Tp-Link-Tl-Wr740n.html

Go to this link:http://www.tp-link.com/support/download.asp?a=1&m=TL-WR740N

TL WR740N can not open yahoo mail, youtube, facebook websites only google.com is working fine any help please.