did you tick usb debugging?

Did you set system path files? to enable ADB to work?
Like this, this is critical step.
Computer>"Right Click" - Select Properties>Advance System Settings>Environment Variables>At bottom find PATH and select edit>Scroll to the last right and add your C:/ (Your ADB path file by default for me is should be ;C:/android-sdk-windows/tools>Then select OK> then OK till all windows closed.

[REMEMBER add semi column in-front.]

Then only use go cmd type adb if you see bunch of helps means you have adb enabled.

As you do like this, you enable fastboot as well~

Very simple you create a file called Android at C drive, then go to your SDK folder where you download all those adb fastboot from Google SDK you copy all of them and paste on your new Android folder at C.

Then at path there you scroll to the right last type like this ;C:/Android

that makes it very simple.

when you need ADB just cmd then type cd C:/Android
then give your usual commands example adb devices to test adb
success should have 12345ABCDE devices

Sorry, my fault typo error -.-

Should be ;C:\Android

IF not if you copy the extracted android file which bundle inside then
;C:\Android\Android

try again?

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Added on April 25, 2012, 12:02 pm
I always playing Android Beam with my Nexus S friend
Share websites~

USB debugging and try again? 

ADB I guess? 

At the top there for "List of device attached"... is there anything there?

install ADB devices then