Android SDK Virtual Device error/problem.

Hi,
I was trying to create a Virtual Device in my Android-SDK.
When I tried to open the device it says error in opening Java Path and after then the blinking ''ANDROID'' came up in emulator screen but nothing happens for next 25 minutes.
At the same time my laptop is getting slow while it’s using 100% CPU.
I would like to know is there any standard configuration for this virtual device like SD card memory, screen size, android version etc. My current config is SD card size- 512. android 2.1 update-1, default screen- WVGA800.
Thanks
Hayat Hasan
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