My laptop goes offline, but others in same office don't

hi- every now and again, my laptop stops accessing the internet. My husband is on the same router and it never happens to him. I'm using an ethernet cord and he is wireless. If I connect wirelessly, I still can't get to the internet.

Rebooting my laptop doesn't work. I tried to do a ipconfig /renew, and that didn't work either, it says the media is disconnected. I replaced my ethernet cord and that didn't help.

The only thing that works is rebooting the modem.

Here's what I get from Ipconfig when the computer won't connect:

C:\Users\Mel>ipconfig

Windows IP Configuration


Wireless LAN adapter Wireless Network Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Ethernet adapter Local Area Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::5c4b:e300:340a:7a0e%12
   IPv4 Address. . . . . . . . . . . : 192.168.1.67
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.254

Wireless LAN adapter Wireless Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Tunnel adapter isatap.{0EE7B629-0171-4C54-B76D-DA8D022CAB4E}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Tunnel adapter Local Area Connection* 11:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Tunnel adapter isatap.{697DBAC7-4B93-4F9E-8FF7-96F549F43E4D}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Tunnel adapter isatap.{C75F073B-D7D3-42CD-9144-005AA8B18361}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Tunnel adapter isatap.lan:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

C:\Users\Mel>

I have a Dell Inspiron N7010, with Windows 7 Home Premium, 64 bit. My Modem is Technicolor TG582n, fairly new since we had it replaced about two months ago. This only started happening after the modem was replaced. When the internet goes down, I can still connect to the modem.

Any idea why this might be happening? I have Mcafee, but could it be a virus?

Probably not related, but I also get an issue where my windows explorer stops operating. (not Internet Explorer, my taskbar freezes and I get an error message saying, "windows explorer is not responding.") I have to close it and start it again. This doesn't necessarily happen at the same time as the computer freeze-up, but I thought I would mention it.