I assume the unit you are interested in has Windows 7 Home Premium x64bit.
The security arrangement on Windows7 is different then XP, does not create a problem for user.
I have installed many utilities and programs that I used on Windows XPHome x86bit units, having little to no problem. Came across a few that could not be installed.
As an aside, Systemax puts together some rather good computers, Tiger Direct sells several different models.
The one I purchased had the basic OS and burner software. It came with all the disc.
This included OS (OEM) disc, Motherboard disc and DVD burner software disc.
Had a folder with all the drivers ie: sound, video etc.