Locksync is when your modem has established its connection and is fully online (all lights are lit or at least blinking). For the ping test, you might also try this one : ping 67.222.32.165 (which is Webmaze's IP number). Using the IP number saves your computer the time to look it up in the DNS database which can be helpful if either your computer or your connection is really slow.
Additionally, if you do not feel comfortable with the start>run thing, the command prompt can be found under start>programs>acccessories as well. Just poke through until you see the command prompt icon in the Accessories menu, click it and it opens the command box you need. Then type in the command and hit ENTER. The ping test normally takes only a few seconds, and the results are diplayed at the end of the test. (For instance, when I did the ping test just now, Windows sent 4 packets, received all 4 back so zero loss; travel time was 82 minimum, 83 max, average 82ms. to Webmaze on an 8Mb cable connection).
I would also check to see if there might be an interference source between the transmitter and receiver -- microwave ovens are especially bad when operating, since they emit radio waves of exactly the same frequency as those used by all wireless networking protocols except Wireless-A, which is far too finicky to use for any home connection. Anything which generates a strong magnetic field can be an interference source, including another computer operating under load, or a radio transmitter such as a CB or Ham radio.
Lastly, if there are several other users on the network, increased network traffic will reduce the amount of bandwidth available to each user, though it should not affect the signal strength as far as I know.
Hopefully the info will be of use to you.
....Arlon