Cannot connect through wifi

I am using Dell Inspiron 1525, Windows 7, BSNL broadband connection and a TP-Link 

300 Mbps Wireless N ADSL2+ Modem Router-TD-W8961N . I also sometimes use use a smartphone and a HP laptop to access internet through wifi.  I always prefer wifi . Everything was going well and I was getting good speed. But from today I cannot connect through wifi from my favorite Dell laptop but could do internet using a port.  The image of Network Connections Properties is 

My  Device Manager looks likes this ....

The fourth one- Teredo Tunneling Pseudo-Interface is yellow and status is This device cannot start. (Code 10)

On update it says its updated.

I am confused whether the four adapters are ok or not , and what to do and how to fix the problem. 

Thanks.