Originally posted by: RebateMonger
Since your original version of Vista is likely a vendor-specific version (Dell, HP, etc.), then it'll require that you Activate Vista. Online Activation will be refused. You'll need to call Microsoft to Activate it.
Large-OEM versions of Vista (and XP) are linked to the BIOS of the PC and should NEVER require Activation as long as you use the (Dell, HP, etc) motherboard it came with. If you try using a Retail or "generic-OEM" version of Vista, you'll have to Activate.
