I'm sorry, but by deleting that 'hidden' partition and then continuing to use the drive you have most likely destroyed any chance that even expensive commercial data recovery services could get it back for you.
I'd suggest you contact Sony's support people, explain your dilemma and see if they have any provision for replacing the bundled software etc that you've lost. (If memory serves me correct there is a procedure to be followed for some Sony Vaio laptops whereby you make 'Recovery' CDs which store the bundled software off the hard drive and onto optical media, but if the partition has been deleted before that has been done then it's too late.)
Sony may be able to provide you with CDs to use for the job of restoring your system, but if so you can expect there to be a fee for service to pay for them doing so.
The most unfortunate thing is that, if Sony have a policy which is like many other manufacturers, they'll have provision for helping you get back running with OS and device drivers, but not one to replace the bundled software you've lost
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Grandad
Offline 3,826 posts
since Mar 2004