Why does my macbook keep disconnecting from my network

im currently using (borrowing) someone elses wireless internet at the moment but i dont see why my macbook is having trouble with the wireless connection from downstairs when it was working fine for the past week, what should i check for to make sure nothing is wrong??? everytime i try to connect to it, the network disappears from my list of networks, could this be due to two other computers using the network?? im rubbish at computer stuff so i need some tips!
cheers

It is very possible that you may have some form of Wi-Fi interference that has been introduced recently in the immediate area that is preventing you from getting a good clean signal to your MacBook.
I suggest you perform a simple site survey, using utilities like MacStumbler or iStumbler to determine potential areas of interference, and then, try to either eliminate or significantly reduce them where possible.
Other things to try:
o Switching channels - In some cases (especially when interference is at play) switching channels on the router can improve reception weakened by various causes.
o Recycle the AirPort card - You may want to try turning your internal AirPort card off then back on if you are having access issues. This can be accomplished through the AirPort menu item, or using Internet Connect (located in the Applications folder)
o Disable any third-party wireless applications (monitors/sniffers) - Some third-party applications that manipulate or otherwise interact with the wireless connection may cause problems.

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