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Unless Dell has the upgrade for the bios to include the larger hardware you are going to be in trouble, I would go online to Dell and check for upgrades to your model if they still support it. The other option is contact customer and technical support to see it they can give you a alternative solution.
Format your machine to its orignial OS (XP Home). There are some limitations that some of machine wont able to carry. The XP Professional might not compatible with your machine. That's why you encouter hang-up from your machine.
Visit support.dell.com, click on drivers and downloads, and then click on the service tag option.... enter the service tag from the bottom side of the laptop... it will then display the list of drivers for that laptop.
Download and install the audio drivers and any other ones that you need.... let me know if that solves it for you. Make sure they are for your laptop model and operating system.
Well, I'm amazed a C640 runs Vista at all.
There's no reason to buy a new hard drive, except for the novenlty of having one loaded with Vista on a C640.
It's a great laptop, and runs Windows XP PRo perfectly well.
If you have one od the Dell XP install disks, just boot from it, and whenever it finds the vista install, hit excape, then at the next screen hit "D" to delete the partition, then choose "quick format", and load the Operation system.
If you need an install disk,let me know.