You'll want to reset your internet. Unplug the router, wait 5 to 20 seconds, and plug it back in. If that doesn't work, try resetting your computer and internet simultaneously.
You can also try re-installing the programs that refuse to work, or perhaps you have a firewall that won't let you use them.
Since your problem has a lot of possible causes, it's too difficult to narrow down to just one reason since the information you've provided was limited.