Very Slow internet connection with WRT150-N Wireless Router

I have a WRT150-N wireless router hooked up downstairs to the modem and I am upstairs right now with internet that is very slow, it shows it is 18 megabytes/second and the connection says poor (i have a wireless G card in this computer).  I have another computer that is about 10 feet away from the router with a wireless N card and it says that the connection is 160 megabytes/second, but again it is running very very slow.  The third computer is back upstairs by this one and it has a Wireless N USB adapter and is running about 170 megabytes per second.  They are all about the same speed in opening websites but again are very slow to do so.  Any ideas on what is going on or how I can get it faster?

First of all, the speeds you are quoting all sound like Mbps (megabits per second) connection speeds, not data throughput speeds.  You really need to measure your actual download speed to tell what is actually going on with your system.
Use speedtest.net and test your system.  Turn off all other computers except the test computer.  Test under the following conditions:
1)  connect one computer, by wire, directly to your modem
2)  connect the same computer, by wire, directly to your router
3)  connect the same computer wireless to your router
4)  connect your other computers, wirelessly to the router, one at a time
Also, state the speed that you are paying your ISP for.
Report your download and upload speeds for all of the above tests.
Note that the speed that you are paying for should be about the same as your results from test 1 and 2 above.
After you have done these tests, it will be much easier to tell where the problem is. 

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