there's a backup wallet option in the file menu of bitcoin qt. then you simply place the backup file in a directory of it's own on the other PC and when you run bitcoin qt for the first time there it'll ask you to set the location of the data dir so you point it to that directory. then wait for it to download and verify  the blockchain.

If your W10 PC's Bitcoin Core isn't fully synced, there's a chance that the balance wont show.
But if it was synced, you can just proceed to send your Bitcoins after finishing rescan.
Based from your screenshot, it looks good and just a few blocks away.

If you want to useknow the "alternative" that I've mentioned above, it's about using dumpwallet command to get the "extended private master key" or private keys then import them to Electrum:

• Start 'Bitcoin-qt' as administrator, then open 'window->console'
• Enter dumpwallet keys.txt (you can change 'keys' into any name that you want)
• Go to the installation directory of your Bitcoin core and find "keys.txt", open it and find something like "# extended private masterkey: xprv****" or the addresses' private keys, list of strings that start with 'K' or 'L'.
• Download Electrum Windows Stand-alone Executable from electrum.org

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• Now you have two options, if your addresses starts with '1', you can use the xprv: Open Electrum and create a new wallet using the option: "Standard wallet->Use a master key", paste your master private key and create the wallet.
• If your addresses starts with '3' or 'bc1', you'll need to import each prv keys to electrum using the option "Import Bitcoin addresses or private keys" by pasting each keys per line using:
  p2wpkh-p2sh:YOUR_Private_key if your addresses starts with '3'
  p2wpkh:YOUR_Private_key if your addresses starts with 'bc1'

here's what i did. i backed up my ubuntu json rpc bitcoin core 0,18.0 wallet.dat and downloaded it using winscp to my windows 64 bit pc. i change the existing wallet.dat file of my bitcoin core windows 64 %appdata% folder in wallet with the one i downloaded from rpc. i then started bitcoin core 0.18.0 in my win10 64 pc using 'C:\Program Files\Bitcoin>bitcoin-qt.exe" -rescan,After the force rescan i input the passphrase and the system accepted it. and i also put gettxoutsetinfo and rescan it. my question is. After doing all these is there any possibilities that my balance won't show after rescan? rescan still in progress. what do you suggest if the btc balance still wont appear to my bitcoin core win10 x64 wallet. If so, please break everything down for me step by step so that i can do it properly. thank you

What he means is wait until your core completely sync and downloaded the whole bitcoin blockchain.

If you have your private keys besides the json rpc you can import it to updated electrum wallet (desktop or android) so you can spend your funds.

Just let Bitcoin-qt sync (speed depending on your hardware and ISP)
and after that, you can send your fund using the "send" tab.

Alternatively, you can import those private keys / extended private master key (xprv...) to Electrum.
Use 'Import Bitcoin addresses or private keys' for prv keys | 'Standard wallet-> Use a master key' if you have the extended key to create the wallet.

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I will make new account with the same email of my bitcointalk account. Kindly close the old one afterwards to avoid multiple account.

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Thanks in advance