I'm using windows 7 on a Dell Latitude laptop. I was using two broadband movil modems (sierra wireless and ZTE). I'm no longer using those devices so I unistall the software and drivers from the laptop. After that I run CCleaner and some registry keys related to the modems were removed. After that I can no longer change the TCP IP IPv4 paramenters of the NIC (I can not set an static IP).
The NIC is working perfectly with DHCP (I'm writing this from the laptop). I tried several thing but none of them restore the functionality.
1) I removed and installed the driver of the NIC.
2) I type the commands; a) netsh winsock reset catalog, netsh int ipv4 reset reset.log.
3) Just in case I run full scan with my anti-virus and malawarebytes. Both reports negative results.
When I go to the NIC status I select Internet Protocol Version 4 but the [unistall] and [properties] buttons are dimmed/disable. The [install] button is active. When I click on it I tried to add the protocol but I get a windows that saids: Could not add the request feature. The error is:The data is invalid.
I also check the wireless connection and I have the same problem. So it seems that all network interfaces have the same issue but all of them works with DHCP.
How can I restore the IPv4 functionality to set parameters manually. Again everything works fine with DHCP.