I don't have a WIFI adapter on this PC but there should be some trouble shooting options in the network and sharing center you could run. I'll have a look latter on when I fire up my laptop. Did you try running inSSIDer just to see what kind of signal you're getting? It might give you a better indication of which WIFI adapter will get the best signal. If you've been swapping a lot of WIFI adapters in and out it might be a good idea to run system restore to try and go back to a more stable setup. I had a lot of wireless problems as a result of my 2.4 GHz wireless phones. I had to switch to Dict 6.0 phones. Baby monitors, microwaves and other devices in the 2.4 GHz band can also mess up your WIFI.