I think you started out wrong. Take the VIC20.ZIP file and extract ALL FILES to the Program Files folder (make sure "use folder names" is selected in WinZip). Start GameBase, if you do not see screenshots, then from the menu, select GameBase->VIC20. Go to Tools->Paths... and set the paths as ...\GameBase\VIC20\Screenshots, etc.
Select GEMUS->WinVICE v1.14 and set the Script Files (vice.ini) and Emulator Path\Fileneme (xvic.exe) to your VICE path. All 10 games are already preconfigured for you with screenshots, memory settings, extras, infos and cartridge addresses, and are ready to run/test.
When starting VIC Invaders, you will notice the comment on the 6th line that says "REM SYS6793 TO START". That means you type SYS7693 to start the game. I specifically included this game, as it is different from the other prg files, as it does not auto-boot or start with RUN. There are many, many VIC20 games on the web, like this one, that take a lot of searching to find (
http://www.kdef.com/geek/vic/). I converted what I could from this collection to run on the C64.
PS. Try registering your name in the forum.