I can't access the internet on our Mac desktop .  I am connected to wifi and other computers in our house can access the internet.

The Mac desktop computer in our house is connected to wifi but you can't browse the internet.  Other computers in our house are connected to wifi and are browsing without any issues.

Go step by step and test.
1.Power Cycle
   Power off the router. Unplug it from the wall. Wait a while.
   Plug it back to the wall. Power the router on. Wait until all the lights are lit properly.
   It will take a while.
  Restart the computer.
  Start up in Safe Mode.
   http://support.apple.com/kb/PH11212?viewlocale=en_US
2.  Turn off Extensions, if any.
     Safari > Preferences > Extensions
3. Turn off proxies, if selected.
     System Preference > Network > Advanced  > Proxies Tab
     Under "Select Protocol", uncheck any box if selected.
     Click "OK" then  "Apply"
4. Uninstall anti-virus software, if any.

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