The issue is not with the BIOS, it's the change of hard drives that's causing OEM 
Vista to want activation.
Because you can't get the phone activation prompt, you may have to start all over 
again.
Use the Acer restore disks that came with the laptop and restore the system.
Immediately try to activate Vista online, once that fails, you should get the prompts 
to activate it by phone. You will be walked through an automated activation system, 
once that fails also, you will get a live person.
Tell them the truth, you had a hard drive failure and had to replace it. They will 
rattle off some numbers for you to input into the activation window and presto, Vista 
will be activated.
In the future, if there is no hardware changes, Vista will activate online.

Good luck!
 

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