Wired Internet Speed ridiculously slow

I am running Windows 8 64 bit on an HP Pavilion p7-1414 Desktop PC.
For a while I have had a pretty good experience, but for whatever reason my brother decided he should do a HP System Recovery and completely reinstalled Windows. Anyways, got everything set up again but noticed that the Internet speed was slower than usual. Contacted my ISP and asked about it and they said it wasn't anything wrong with the connection. Before the recovery I did not have this problem, but I noticed that it gets EXTREMELY bad when I install AVG free or even BitDefender, any antivirus besides Norton. I can try downloading say, a game, and the internet speed will start out at the usual 1MB per second, then it will rapidly decrease until it gets to about 15-400kb per second. If I pause and unpause it, it will start higher than 400 but then decrease to its usual speed.
I have tried another reinstallation of Windows, which didn't do any good. I have installed all possible Windows updates and Driver updates.
I just don't know what to do now, has anyone else ran into this problem and managed to fix it?
Edit: I should also mention that for some reason the Wireless adapter will not work on this computer anymore either, this happened after the first reinstallation. I have tried two different networks, neither work on my computer but work flawlessly with my Android phone and Xbox 360.
I'm not sure but maybe the Internet driver has something to do with it? In any case, the one I have is Qualcomm Atheros AR8161 PCI-E Gigabit Ethernet Controller (NDIS 6.30) while the wireless one is: Ralink RT5390R 802.11bgn Wi-Fi Adapter.
Any help or advice would be greatly appreciated!

If you have installed and uninstalled multiple antivirus it is possible that some remnants of one are interferring with another.
It's just a hunch, but that's what I think it is.
I would suggest getting rid of Norton completely since their antivirus costs money and is a resource hog.
There is a program to uninstall it, search for it on google, called nonav.exe (No N.orton A.nti V.irus) and it thoroughly deletes all traces of norton.
As far as wireless goes there might be a switch that isn't obvious.  When you go to device manager, is it installed?

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