The SWSetup files are unzipped software files (chipset, ethernet/NIC, video, sound) normally downloaded from the product support download page for your computer's manufacturer. You can locate those
drivers there.
Windows 7 will provide almost all of your latest
drivers on the installation medium and in successive optional Windows Updates.
So if you are doing a clean install, it won't be necessary to hunt down the
drivers on the computer's download web page, Nvidia/Intel website, etc. However you may need to have your ethernet or wireless
driver handy in case it isn't included in the Windows 7 installer so you can get online to Update and research missing drivers.
If you're doing an Upgrade install, all of your programs, drivers and most settings will normally be transferred to the upgraded system.