Unable to connect with wifi. My wifi has a litter yellow "!" upper.

Hi, the "yellow shield" means that the "geese" wireless network does not have wireless security enabled. If you open Windows Help and Support, and copy/paste this text: How do I know if a wireless network is secure , you can confirm this.Don

Yep, it means you can connect your computer to this wireless network without any authentication, usually is pre-shared key authentication. It also means anyone that could detect this wireless network can connect to it freely. You should enable wireless encryption (WPA2 with pre-shared key) on wireless router, so that it needs pre-shared key authentication before allowing your computer connecting to it wireless. If you need help, can check out this wireless router configuration example. Hope this helps.