I'm having a problem with opera and Skype?

While opera and Skype can't connect to the internet, IE can and also steam and minecraft; I can't figure out what's the issue, I rebooted the router and modem, that didn't work, I do a scan with AVG for viruses and nothing, so, what's the issue here? I have them both allowed through my firewall, fairly certain I have no viruses, so… What's the issue here? If it helps I got time warner cable 15 megabit internet…

Sometimes antivirus disabled some applications because of security. So to solve your problem reinstall again Skype and opera and after that still you face the problem then check your antivirus blocked setting or reinstall antivirus again. By doing this your problem will definitely solved.

Disable your firewall temporarily to check.
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Also try and remember when this happened and what changed just prior. Updates, upgrades, new software?

If some things work but others don't it is probably not your modem or router.