Pre-Installed or From Scratch
Mind you, if you install Windows from scratch, a lot of stuff won't work unless you've got the drivers. If you have bought a machine with *any* OS pre-installed it will ( or should) work out-of-the-box.
Pre-Installed Win7 versus user-installed Linux is an Bananas v. Oranges comparison.
At least with GNU/Linux the drivers can nearly always be got from a reputable source, i.e. a site that is unlikely to host malware/adware & isn't going to demand money, etc. You can't always say that for Windows - a driver search can often throw up a lot of shite & pay sites.
Try installing Windows 7 on an IBM S/390 or one of many machines with an M68000 CPU or loads of other architectures - won't get very far will you...