|In light of what you've done and tried, I suspect the issue is the wireless interface in your computer.|
Check in Device Manager to ensure it's working properly. You may will also want to ensure you have the most recent drivers for that interface.
If it's shown as working in Device Manager and you have the most up-to-date drivers then the issue may be corrupt files in the TCP/IP stack. If that seems to be the case, uninstall the TCP/IP stack, reboot and reinstall it.
If it's still not working, you may need to replace the wireless interface.