f**k steam. read all please!

[Kein]

And of course you now reinstalled the things and did a lot of write-operation on the disk, amiright? Congratulations! You just buried your chance to restore data.
NEVER, never do any actions (file copying, moving, etc) on the physical disk where important data was, because such action could overwrite the sectors and make restoration impossible.
First thing you do after you stopped to desperately RAEG all over - use some tools like EasyRecovery and try to restore deleted data.