Problem With Wired Internet Connection Extremely Slow Speeds

It all started out a week ago with random times where my internet speed would drop drastically but after about 5 minutes it would go back to normal. Then about 5 days ago I couldn't connect to cable with my cable modem the activity light would just pop green over and over again. I used cycling over and over and couldn't get it to work. Finally just today I cycled it and was able to connect to the cable. Whereas earlier I was connected to my network with "no internet access" now I have internet access. Now even thought I'm connected my speeds are at an all time low and I have no ideas why. Any help would be very appreciated!

It seemed that over the night my speed has increased but I did do what you said and updated my drivers and I had already checked the properties on my local connection. Is there any way to prevent this from happening? Any idea whats wrong?

Update: After updating my driver and running smoothly this morning. As of right now my internet is slowing down again...