The Sony drivers will be on the .... Sony website.
If you're installing Win7 with SP1 there's a very good chance they're already included in the driver collection on the install disk.
Also if you're doing an install the 'advanced' options usually give you a chance to create a new partition and format it prior to the OS install.
If you want to create a new partition from the current laptop OS Windows 7 has a built in utility to partition a hard drive. You can read about it here:How To Create A Partition In Windows 7