does the old drive contain data only or is the operating system installed to it?
you could put both drives in you pc and either copy the data to the new drive or use an imaging program, such as driveimage or ghost, and make an image of your system drive. then apply the image to your new drive and everything will be as before, just more disk space. be aware that you need a place to store the image at. can be a usb hdd...
hope this helps you
mscrx