Depending on how old or new the disk is, you should first try to clean the disk itself with some proper disk cleaning material you can find a suggestion in our troubleshooting page. Otherwise I would buy a disk cleaning set from your local supermarket. If this does not solve your issue then your disk reader can be dusty or just malfunction you can buy a disk reader cleaner at your local supermarket. If these do not help again check out the troubleshooting page link above.
First thing you should check is your Wi-Fi router and connection. Try connecting to the internet on your cell phone, tablet, or smart TV first if you have one to see if your router is working properly. If your Wi-Fi checks out then proceed to restarting your device and go to the network settings through the settings option on the main portal. If you need more troubleshooting help check our troubleshooting page.