Are you sure that moving that far away Range didnt come into effect and you lost out on sigal.
best you try a proper anti virus program, with a firewall, that would give you insight on if anythings up, Ie firewall whos connections in and out, so bad connections or programs running you can disuse/block.
run a rootkit virus scan,
full system scan
adware scan,
and check your network settings to make sure its not proxy'd IE given a waste of a time ip and port, or SOCK connetion,
make sure your in rage of your router,
i wouldent change automatic settings for yoru network, you might be using an ip of 192.168.1.10 but in a range of 192.168.0.0 / 192.168.0.255.
i would recomend comodo system security, for security, good maintenance and easy troubleshooting.
WorldHack.