@mynameissstamara , ok the 4GB patch for Sims 2 combines all the patches ever released for Sims 2 and its expansion and stuff packs. Since the game no longer is supported by EA, several players have combined the patches that were released for Sims 2 into one giant patch for the disk version of the game. This insures that your game is up to date and corrects many bugs and issues that were found during the initial release of the game. If you play the game through Origin, you do not need the 4GB as Origin automatically updates the game when it is installed.
NRAAS was a modder who created mods for Sims 3 which fixed many of the issues the game had. Those mods will not work for Sims 2 or 4.
In order to increase your Virtual Memory, you need to Google search specifically for "How to increase your Virtual Memory". You do not need to add Sims 2 or any other game title to find these instructions.