It really depends on what specifically the shop did to restore your PC. If they reformatted the drive and reinstalled Windows, that almost certainly overwrote some files and those will not now be recoverable.
All you will be able to recover at best from the drive is personal data. You will not be able to recover settings, website information (including user accounts and passwords) or applications.
You will also need another drive large enough to hold the files and folders you want to recover because you can't recover them to the old drive.
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