Hello Rick, Sorry for the delay. I finally figured out the problem - it is the modem/router itself. It's really old and has some security function where it kicks out incoming connections if there are a few already present. Had to reset the IP gateway right from the router itself.  I really appreciate all the help from you, Thanks.
Hello, 2 days ago, my laptop was connected to my router and working fine. But it then randomly disconnected and haven't been able to connect back since. I am using an ethernet cable to access the internet, and have tried many ways to try and resolve the issue but nothing is working. I have a Dell L501x (Win 7 64-bit) with the Intel Centrino 1000 BGN wifi card. I have restarted the router and modem and disconnected all devices and tried reconnecting, but to no avail. I have tried updating the drivers, system restoring and using safe mode (with network) but nothing works. The modem and router are working fine as other devices connect and access the internet, it is just my laptop that cannot.  I am sure it is not a hardware issue as the card detects all the surrounding networks. The troubleshooter only says "An administrator profile failed to obtain an IP address from the DHCP server." I would appreciate some help with this problem, Thanks.
Wifi issue with Dell L501x