i used to have 50-65 ping and now its like 300

Do a tracert to anywhere yet to see if ya have some bad hops?

OK i've had this problem before. Go Control Pannel, Then Network and Internet. Make sure your windows firewall is on. When you hit Network and Internet Hit Windows Firewall.
Then hit Change settings. Make sure the firewall is on and its blocking all incoming connections. This is what i did to solve that.