yeah basically, i have two hard drives and the windows 10 was my primary now that is still messing up for some reason, i reinstalled win10 pro and everytime it starts up its stuck at a black screen, so im using an old win 7 on my 2nd hard drive, i shouldnt have formatted my primary hdd but i could barely get into win7 so i didnt know it would work or not and i was in a rush to get win10 back up and runining, now ive backed myself into a loss of bitcoins and loss of possibly getting a pandaminer.
OK... So first things first: make sure you are not booted from the harddisk that contained the wallet.dat, do not write any data to the harddisk that contained the wallet.dat and try one of the many available utilities that are designed to recover files that are deleted/formatted.
If we are talking about a lot of BTC, i'd personally unplug the harddisk, and use dd to create a complete copy of all sectors on this harddisk... Then i'd try to restore the files myself. If i was unable to do so, i'd try to hire a professional. If we're not talking about a lot of BTC, i would omit the last step.
BTW: I just realised your title said you were using bitcoin core... sorry
Basically, if you want to recover your funds, you NEED your wallet.dat. No wallet.dat => no funds... password+address are not sufficient to restore your wallet...