OK I found the AppData folder. And from what I understand if I delete all the files/folders in the AppData folder and reinstall the whole Bitcoin Core client that I should be good then? Am I supposed to delete all those files and folders and just immediately fire up Bitcoin Core to re-download the whole block and all that or am I supposed to delete all the files/folders in the AppData/Roamin/Bitcoin folder then uninstall Bitcoin Core, reinstall Bitcoin Core, and THEN fire it back up?
be carefull deleting all folders under %appData%
this is a OS folder used from many programs...
1) backup your %appData%\bitcoin folder, specially wallet.dat where are your bitcoins, and the blockchain file.
2) delete %appData%\bitcoin folder.
3) reinstall qt-wallet
4) replace %appData%\bitcoin wallet and blockchain with files backupped.
you are ready to work.