please help me reactivate my CS4 after a hard drive crash and replacement
You are kind of stuck between a rock and a hard place, as Adobe will not give you telephone support on a product that old. I'll edit your subject line to ask for Staff assistance, and raise a request for the same in the 'Backroom' forum.
Contact Adobe Customer Care via Chat
Contact Customer Care
Ask for activation support and nothing else. Get your activation count re-set.
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