Here is another idea.. Unplug your router from the power cord, leave it for about 30 seconds and then plug it back in.
I still think you should try Driver Booster to make sure all your software is up to date. All you are trying could be pointless if all your drivers are not updated.
You could also try Speed Test to double check your internet speed and/or for packet loss.
You have not mentioned if you have tried another browser ! By eliminating all the above it will be much easier to help you instead of guessing all sorts of things of what it could be.
Another one to try is Patch My PC to check for driver updates. Just remember you can always remove these and any other programs at the end of testing so they do not have to stay on your PC.