i have found the files
The wallet file should be called "wallet.dat". Ok, now start that new version Bitcoin Core on that pc. It will create it's data folder, you can look up the location on the link I post earlier. I think it should create a wallet.dat file as well. Now just turn the Bitcoin Core off, don't need to wait for the sync to finish and replace the new wallet.dat in your data directory with your old wallet.dat from the usb. You might need to run Bitcoin Core with the option "--rescan" next time you start your Bitcoin Core. Either way, after sync is over (it can take quite a while), you will be able to use your bitcoins normally.