The ETA for the 5700 chip is until March.
ALL the zd7k had to go through the same, there weren't any motherboards left.
I agree, the service mostly sucks and you shouldn't need to ever send your NB back from service. If this time...
Run the HDD-Self Test from the BIOS. If successful then most likely your HW is ok.
Access Windows in safe mode and check how it runs, if it runs faster then there is something wrong with your software. Format and install Windows and the...
Don't even try to send it to HP, they will charge you 698+tax for that repair. Your best bet is an external card (USB or PC Card should be fine).
Most popular electronic stores have a 15 day return policy.