You are not an idiot, a lot have had the same problem. The OP should be changed to reflect the following procedure:
1) download new wallet.
2 ) back up old wallet.
3) windows start menu type %appdata% this brings up your roaming folder.
4) navigate to bitcoindark folder
5) make new folder in here called backup, copy all contents of folder here. use this to restore original files if things go wrong.
6) delete everything except wallet.dat and your backup folder.
7) right click, create new text document.
paste node info from OP
9) save as ... switch choice from "text file" to "all files" bitcoindark.conf
10) go to new wallet download
11) unrar and click on wallet to open. it assembles the missing files in your appdata folder.
12) make a cup of coffee, wait for wallet to sync blockchain
If I have missed anything here, others feel free to jump in.
If you have a working older wallet and are worried about trying to fix something that isn't broken, is there a reason you should not:
1) Backup your wallet.dat file. (Obviously, there is no reason to do this again because everyone here is smart and already has multiple backups. Right?)
2) Download and un-rar the new wallet from OP
in a different location, leaving the existing wallet as it is (though not running).
3) Copy wallet.dat to relevant folder for new download. Maybe play games with .conf, not sure.
4) Run new download. Check it is working. Only then delete old one.
Edit: looks like the different versions would still use the same Roaming folder?