|It's probably a Recovery disk SET of disks.|
You don't necessarily need one unless the original hard drive has failed and you have replaced the hard drive.
READ the Recovery info for your model !
That may be in the Owner's or User's manual for your model, which is available in the support for your specific model on the Sony web site, or in any case somewhere on the Sony web site in the support for computers.
This web site has brand name system Recovery disks the same as the original ones and lists your model....
You MAY be able to download the files with which you can make your own set of disks on another computer as soon as your payment has cleared.
(If you don't have a credit card, or you do but you don't want to use it online, you can set up a Paypal account to use a specific bank account.)
If you merely want to install a larger hard drive, if Windows is working fine on the original hard drive, you can use a free version of cloning software to copy the entire data contents of the original drive to a larger drive, then swap drives.