Need help in writing a vbs script

I am very new to scripting and need help in scripting the following:

When the Windows 7 machine boots up or a user logs on (easy to do with GPO), I want to execute a script that starts some servicesONLY if the length of the computer name is less than or equal to 15 else it should exit. It has to be done in the background without any user interaction.

The script should be able to work for both x86 and x64 version of Win7.

Any help would be greatly appreciated.

Thanks in advance.

JD

JD