Problems with different routers and adapters

I recently moved out of my parents house and I'm having problems with the new internet connection. Both places have comcast cable. I have a rosewill RNX-MiniN2 adapter, and it worked great with the linksys E1200 router at my old house. The new house has a good ol' linksys WRT54G router. I can only get about 40kbps download speeds with it. Here's what we did:

1. Bought a new linksys EA2700 N600 router
2. Ran a 60-foot(ish) ethernet cable directly to the router (this worked, 22mbps download speeds)
3. Put my friends computer with a TP-Link TL-WN881ND adapter in my room; he had no problems with the connection
4. I bought a new TP-Link TL-WDN3800 adapter, and it works at first, but after a few minutes it goes back down to about 40kbps
5. I completely wiped my computer and re-installed windows 7. I still have a bad connection.

I've given up. Does anyone have an idea of what could be wrong with my computer? After a new adapter, a new router, and a clean install I'm out of ideas. Thank you for your help!
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  1. Who manages the new router? Are you sure someone hasn't applied a QoS policy that throttles bandwidth for certain users if they exceed a certain data threshold?

    Are you sure the ISP isn't throttling for the above reason? It seems strange that you were able to get normal.

    I see that you ran an Ethernet able and got normal speeds. Was that also the case after your wireless dropped down to 40Kbps?
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