Android SDK newb install question

I've done my best to do this on my own, but I think is time for help. I downloaded the SDK for offline installation. I got the following components:

• Android SDK tools r3
• Android SDK r8
• Android Platform 2.2

I installed the SDK, copied the tools into the platform-tools folder, and the SDK just won't work. I tried running a sample, it didn't work and even tried running a new avd and it stays with a black screen.

Any help would be very appretiated Thanks

UPDATE

Thanks for your help, the emulator is already starting but Eclipse does not recognizes the installation, it gives an error:

Could not find C:\Program Files\Android\android-sdk-windows\tools\adb.exe!

I looked for the file and seems is not there, but I used a regular install usi开发者_开发问答ng the installer_r08-windows.exe file! Is there anything wrong here??

The emulator might take quite a while to load when running for the first time.

Well,If you are running for the first time it will take time to boot up !