Caveman with a computer

[BulletCatcher]

don't worry about ports yet. Go with the simple fix attempts first.

unplug your modem, wait 30 seconds plug it back in.
Is the internet choppy still? is your modem near any other electronics like a microwave or something that gets hot?

Check your cables. Are they clean and in good condition? replace if they are warped, cut open, or if you can see exposed wires. Also what kind of cabling is it? CAT5? CAT5e? CAT6? It will be labeld on the cable itself. You will at least want 5e. with is 100Mbps. How many other people are using the same internet connection? Wireless and/or wired?

you can always contact your ISP and tell them you experiencing trouble all around and you would like them to reset the connection on their end. If it is Time Warner Cable, you can reset your connection from their end using a smart phone app. (maybe the website too, not sure)

Does your computer have enough space around it to breathe with good airflow? Is your PC hot to the touch?

Can you open the task manager and look at the performance tab? Any of those graphs maxed out?