I have a Linksys WRT160N router that I am using with a MacBook Pro laptop running Snow Leopard. I used my computer (with some difficulty) to set up the wireless access by way of a wired connection. The other Macs in our family connect to the wireless network without a problem, but recently my computer shows that it is connected but cannot access the internet (using Safari). The network locations screen shows three items: automatic, WRT160N, and WRT160N2. My computer will successfully access other wireless networks without difficulty using WRT160N2. Thank you for any help that you are able to suggest.

There are two ways to set Mac OS X Snow Leopard to run in 64-bit mode.
The first way is quite simple: you just have to hold down "6" and "4" keys while the system is booting up.
The second way is simple as well. You only have to search for a file named "com.apple.Boot.plist" in /Library/Preferences/SystemConfiguration. Open it with Text Editor and edit line 9: where it reads "<string></string>", change to "<string>arch=x86_64</string>". Without quotes, of course.
Using the second way, Mac OS X Snow Leopard will boot in 64-bit mode whenever you turn on your computer.
PS: 64-bit mode is available just in some machines like MacBook Pro and Mac Pro. To check if your Mac supports 64-bit mode, write the following command in Terminal, again without quotes: "ioreg -l -p IODeviceTree | grep firmware-abi". You will get the answer "firmware-abi" = <"EFI64"> if your system can run in 64-bit mode or "firmware-abi" = <"EFI32"> if not.