All of my Windows computers won't connect to the Internet (LAN or Wi-Fi). Any ideas?

All of my Windows computers (that's 1 desktop connected to LAN, and 2 laptops via Wi-Fi - all running Win7) won't connect to the Internet. The desktop says my LAN connection / Ethernet Adaptor might have a problem, while both my laptops say "Limited Access".

The service team from our Internet Service Provider tried to connect their laptop to our LAN and Wi-Fi, and both worked fine for them - so they assume that our problem is caused by a virus. The weird thing is, my Macbook, iPhone, iPad, and Nexus 7 can all connect to the Internet with no problems. Also, it might be worth noting that I can boot into Windows 7 on my Macbook, and can connect to the Internet using this.

Any ideas on this? The only thing I remember doing lately that may have contributed to this problem is that I tinkered with our Wi-Fi security settings (changed it from WPA2 to WPA-Personal) and changed the password. I've already changed the properties for all of my computers to set our connection to WPA-Personal.

Here are the things that have already been tried:
1) Disabling and enabling the LAN connection (desktop) and Wi-Fi (laptop)
2) Hard reset the router
3) No changes in any proxy settings
4) Reset the TCP/IP Winsock

I can't really pinpoint what virus this could be (if it really is a virus causing it) because it seems weird that it'd attack 3 computers - all of which have Antivirus programs, and 2 of which I don't even use that much. Any suggestions would be appreciated.

How is your ip configuration do you manually add your router or is it assigned DHCP or a hybrid dns. It could be that the authentication has gone a bit funny due to your lease not renewing.

open a command prompt type and hit enter after each command
ipconfig /release
ipconfig /flushdns
ipconfig /renew

see if that helps if not log into your router and investigate.

and most obvious of all i'm assuming you have already tried resetting your router.

Try update your wirless drivers on your un-connected pcs and did you try restarting the pcs?

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