The prime suspect for lack of access is a non-Windows firewall or security suite.
150meg meaning 150 megabytes? If so that would be 1200 megabits in 120 seconds equals 10 Mbps.
That's perfect if one of the links in the path is 10 Mbps ethernet.

About as expected or maybe a little slow if both PCs are using 'G' wireless. About 1/2 or a bit less of expected if one PC is using 'G' wireless and the other 100 Mbps ethernet.