Windows7 can't connect to any network

[SIO]

Today I've installed some updates from Windows Update and installed SAP client. Then I've rebooted my machine.

After that I was unable to connect to any networks.

1. 3G/GSM modem connection fails with error 720 "A connection to the remote computer could not be established. You might need to change the network settings for this connection"
   
2. Wimax connection (Yota) goes well until "Getting an IP address...", then fails
   
3. Wi-fi connection to another computer looks ok, but if I open status page and look into 'details' section - it is empty, and no IP information appears. Ping another computer doesn't work
   

I've reverted updates, tried system restore to the beginning of the week - didn't help

I assume there are some problems with receiving an IP address, so I've checked that 'DHCP client' and 'TCP/IP NetBIOS Helper' services are started.

I've also checked device manager -> hidden devices -> 'TCP/IP Protocol Driver' and 'TCP/IP Registry Compatibility' are enabled and "are working properly"

Then I've run virus check:

• AVG Free full scan showed nothing
  
• Dr.Web CureIt Express Scan found nothing
  
• Dr.Wed CureIt Complete Scan is still running. Nothing found yet
  

So, now I'm out of ideas on diagnosing this problem and asking for your help here.

[kemical]

Today I've installed some updates from Windows Update and installed SAP client. Then I've rebooted my machine.

After that I was unable to connect to any networks.

1. 3G/GSM modem connection fails with error 720 "A connection to the remote computer could not be established. You might need to change the network settings for this connection"
   
2. Wimax connection (Yota) goes well until "Getting an IP address...", then fails
   
3. Wi-fi connection to another computer looks ok, but if I open status page and look into 'details' section - it is empty, and no IP information appears. Ping another computer doesn't work
   

I've reverted updates, tried system restore to the beginning of the week - didn't help

I assume there are some problems with receiving an IP address, so I've checked that 'DHCP client' and 'TCP/IP NetBIOS Helper' services are started.

I've also checked device manager -> hidden devices -> 'TCP/IP Protocol Driver' and 'TCP/IP Registry Compatibility' are enabled and "are working properly"

Then I've run virus check:

• AVG Free full scan showed nothing
  
• Dr.Web CureIt Express Scan found nothing
  
• Dr.Wed CureIt Complete Scan is still running. Nothing found yet
  

So, now I'm out of ideas on diagnosing this problem and asking for your help here.

Hi SIO,

do you which updates you received exactly?