deleted Bitcoin Wallet before transaction processed
Whenever you create a new wallet, a number of private keys are generated for you. These private keys are used to authenticate yourself as the owner of bitcoins sent to the keys' corresponding addresses. Therefore, you must keep these private keys safe. For Bitcoin Core, these private keys are in a file called wallet.dat in the Bitcoin directory. If you've deleted this file there will be no way to recover your coins, as private keys cannot be regenerated. 

However, I think that the wallet file may remain even when Bitcoin gets uninstalled, so if you didn't delete the whole directory, but just uninstalled it, you might want to check if you can still find the wallet.dat.